| 11 Aug 2025 | Quarterly Results & Others | To consider other business matters. | 
                                    
                                        
                                            | 16 May 2025 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 31 Jan 2025 | Quarterly Results & Others | To consider other business matters. | 
                                    
                                        
                                            | 25 Oct 2024 | Quarterly Results | - | 
                                    
                                        
                                            | 02 Aug 2024 | Quarterly Results | - | 
                                    
                                        
                                            | 14 May 2024 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 30 Jan 2024 | Quarterly Results | - | 
                                    
                                        
                                            | 14 Oct 2023 | Quarterly Results | - | 
                                    
                                        
                                            | 03 Aug 2023 | Quarterly Results | - | 
                                    
                                        
                                            | 12 May 2023 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 11 Feb 2023 | Quarterly Results | - | 
                                    
                                        
                                            | 07 Nov 2022 | Quarterly Results | - | 
                                    
                                        
                                            | 12 Aug 2022 | Quarterly Results | - | 
                                    
                                        
                                            | 20 May 2022 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 07 Feb 2022 | Quarterly Results | (Revised) | 
                                    
                                        
                                            | 11 Nov 2021 | Quarterly Results | - | 
                                    
                                        
                                            | 11 Aug 2021 | Quarterly Results | - | 
                                    
                                        
                                            | 14 May 2021 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 10 Feb 2021 | Voluntary Delisting of Shares | Inter alia, to consider and approve proposal of voluntary delisting of the equity shares of the Company. | 
                                    
                                        
                                            | 29 Jan 2021 | Quarterly Results | - | 
                                    
                                        
                                            | 19 Oct 2020 | Quarterly Results | - | 
                                    
                                        
                                            | 09 Sep 2020 | Quarterly Results & Preferential Issue | - | 
                                    
                                        
                                            | 17 Jun 2020 | Audited Results & Final Dividend | - | 
                                    
                                        
                                            | 31 Jan 2020 | Quarterly Results | - | 
                                    
                                        
                                            | 23 Oct 2019 | Quarterly Results & Others | The Voluntary Delisting of Equity Shares of the Company from The Calcutta Stock Exchange Limited. | 
                                    
                                        
                                            | 08 Aug 2019 | Quarterly Results | - | 
                                    
                                        
                                            | 13 May 2019 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 04 Feb 2019 | Quarterly Results | - | 
                                    
                                        
                                            | 03 Nov 2018 | Quarterly Results | - | 
                                    
                                        
                                            | 30 Jul 2018 | Quarterly Results | - | 
                                    
                                        
                                            | 15 May 2018 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 08 Feb 2018 | Quarterly Results | - | 
                                    
                                        
                                            | 16 Oct 2017 | Quarterly Results | - | 
                                    
                                        
                                            | 24 Jul 2017 | Quarterly Results | - | 
                                    
                                        
                                            | 22 May 2017 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 30 Jan 2017 | Quarterly Results | - | 
                                    
                                        
                                            | 27 Oct 2016 | Quarterly Results | - | 
                                    
                                        
                                            | 03 Sep 2016 | Quarterly Results | - | 
                                    
                                        
                                            | 25 Jul 2016 | Quarterly Results | - | 
                                    
                                        
                                            | 30 May 2016 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 03 Feb 2016 | Quarterly Results | - | 
                                    
                                        
                                            | 07 Nov 2015 | Quarterly Results | - | 
                                    
                                        
                                            | 22 Jul 2015 | Quarterly Results | - | 
                                    
                                        
                                            | 22 May 2015 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 03 Feb 2015 | Quarterly Results | - | 
                                    
                                        
                                            | 07 Nov 2014 | Quarterly Results | - | 
                                    
                                        
                                            | 21 Jul 2014 | Quarterly Results | - | 
                                    
                                        
                                            | 21 May 2014 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 31 Jan 2014 | Quarterly Results | - | 
                                    
                                        
                                            | 11 Nov 2013 | Quarterly Results | - | 
                                    
                                        
                                            | 10 Aug 2013 | Quarterly Results | (Revised) | 
                                    
                                        
                                            | 30 May 2013 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 11 Feb 2013 | Quarterly Results | - | 
                                    
                                        
                                            | 05 Nov 2012 | Quarterly Results | - | 
                                    
                                        
                                            | 28 Jul 2012 | Quarterly Results | - | 
                                    
                                        
                                            | 25 May 2012 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 06 Feb 2012 | Quarterly Results | - | 
                                    
                                        
                                            | 21 Oct 2011 | Quarterly Results | - | 
                                    
                                        
                                            | 22 Jul 2011 | Quarterly Results | - | 
                                    
                                        
                                            | 23 May 2011 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 08 Feb 2011 | Quarterly Results | - | 
                                    
                                        
                                            | 02 Nov 2010 | Quarterly Results & Others | To enter into a Consortium Agreement, Joint Bidding Agreement with Bombardier Transportation India Ltd., a 100% subsidiary of Bombardier Inc. | 
                                    
                                        
                                            | 27 Jul 2010 | Quarterly Results | - | 
                                    
                                        
                                            | 29 May 2010 | Audited Results & Dividend | - | 
                                    
                                        
                                            | 13 Jan 2010 | Quarterly Results | - | 
                                    
                                        
                                            | 26 Oct 2009 | Quarterly Results | - | 
                                    
                                        
                                            | 23 Jul 2009 | Quarterly Results | - | 
                                    
                                        
                                            | 22 Jun 2009 | Others | To issue of equity shares or other convertible instruments of the Co. via one or a combination of measures, including a pref. allotment, QIP, FCCB, GDR or any other equity not exceeding Rs 200 Crs. | 
                                    
                                        
                                            | 19 May 2009 | Audited Results & Dividend | Interalia, to recommend the Dividend on Preference Shares of the Company. | 
                                    
                                        
                                            | 31 Jan 2009 | Quarterly Results | - | 
                                    
                                        
                                            | 20 Oct 2008 | Quarterly Results | - | 
                                    
                                        
                                            | 11 Sep 2008 | To consider appoitment of Chairman | To appoint Shri. S K Poddar, Executive Vice Chairman as the Chairman of the Company against the vacancy caused due to sudden and sad demise of Dr. K K Birla. | 
                                    
                                        
                                            | 31 Jul 2008 | Quarterly Results | (Revised) | 
                                    
                                        
                                            | 16 May 2008 | Dividend & Stock Split | - | 
                                    
                                        
                                            | 14 Jan 2008 | Quarterly Results | - | 
                                    
                                        
                                            | 26 Oct 2007 | Quarterly Results | - | 
                                    
                                        
                                            | 18 Jul 2007 | Quarterly Results | - | 
                                    
                                        
                                            | 08 May 2007 | Audited Results | - | 
                                    
                                        
                                            | 19 Jan 2007 | Quarterly Results | - | 
                                    
                                        
                                            | 25 Oct 2006 | Quarterly Results | - | 
                                    
                                        
                                            | 28 Jul 2006 | Quarterly Results | - | 
                                    
                                        
                                            | 12 May 2006 | Accounts | - | 
                                    
                                        
                                            | 21 Jan 2006 | Quarterly Results | (Revised) | 
                                    
                                        
                                            | 18 Oct 2005 | Quarterly Results | - | 
                                    
                                        
                                            | 19 Jul 2005 | Quarterly Results | - | 
                                    
                                        
                                            | 05 May 2005 | Dividend | - | 
                                    
                                        
                                            | 31 Jan 2005 | Quarterly Results | - | 
                                    
                                        
                                            | 16 Oct 2004 | Quarterly Results | - | 
                                    
                                        
                                            | 30 Jul 2004 | Quarterly Results | - | 
                                    
                                        
                                            | 12 May 2004 | Accounts | - | 
                                    
                                        
                                            | 30 Jan 2004 | Quarterly Results | - | 
                                    
                                        
                                            | 08 Nov 2003 | Right Issue of Equity Shares | - | 
                                    
                                        
                                            | 27 Oct 2003 | Quarterly Results | - | 
                                    
                                        
                                            | 30 Jul 2003 | Quarterly Results | - | 
                                    
                                        
                                            | 05 May 2003 | Accounts | - | 
                                    
                                        
                                            | 16 Jan 2003 | Quarterly Results | - | 
                                    
                                        
                                            | 23 Oct 2002 | Quarterly Results | - | 
                                    
                                        
                                            | 30 Jul 2002 | Quarterly Results | - | 
                                    
                                        
                                            | 08 May 2002 | Accounts | - | 
                                    
                                        
                                            | 28 Jan 2002 | Quarterly Results | - |