v3.26.1
Other expenses - Summary of Other Expense (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Disclosure Of Detailed Information About Other Expenses [Abstract]        
Legal and professional fees ₨ 2,545 $ 27 ₨ 1,412 ₨ 1,438
Corporate social responsibility 369 4 311 240
Travelling and conveyance 949 10 444 520
Lease rent relating to short term leases 91 1 35 43
Director's commission 49 1 76 83
Rates and taxes 1,633 17 1,045 1,065
Insurance 1,175 13 997 1,153
Operation and maintenance 7,498 80 6,270 5,937
Repair and maintenance 294 3 157 243
Loss on sale / damage/ retiral of property, plant and equipment 718 8 18 292
Advertising and sales promotion 115 1 84 105
Security charges 721 8 605 542
Communication costs 325 3 235 247
Impairment of inventory 120 1 50 254
Impairment allowances for financial and other assets 627 7   1,573
Warranty expenses (refer note 22) 194 2 71  
Donation 196 2 428 490
Liquidated damages 705 8 179 240
Power & fuel 710 8 258  
Miscellaneous expenses 1,021 11 108 369
Total ₨ 20,055 $ 214 ₨ 12,783 ₨ 14,834