v3.26.1
Right of use assets - Summary of Right of Use Assets (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 quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets ₨ 14,506     ₨ 12,898
Charge for the year 386 $ 4 ₨ 97 470
Ending balance Right-of-use assets 18,314 195 14,506  
Leasehold land        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 13,900     12,432
Ending balance Right-of-use assets 17,673 188 13,900  
Building        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 606     466
Ending balance Right-of-use assets 641 $ 7 606  
Cost        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 17,101   14,873 12,065
Additions during the year 5,104   2,463 3,253
Acquisition through business combination 187      
Disposals and adjustments during the year (1,209)   (235) (445)
Exchange differences 16      
Ending balance Right-of-use assets 21,199   17,101 14,873
Cost | Leasehold land        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 15,491   13,654 10,865
Additions during the year 4,886   2,072 3,234
Disposals and adjustments during the year (728)   (235) (445)
Ending balance Right-of-use assets 19,649   15,491 13,654
Cost | Building        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 1,610   1,219 1,200
Additions during the year 218   391 19
Acquisition through business combination 187      
Disposals and adjustments during the year (481)      
Exchange differences 16      
Ending balance Right-of-use assets 1,550   1,610 1,219
Accumulated Depreciation        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 2,595   1,975 1,447
Charge for the year 386   97 470
Capitalised during the year 415   558 108
Disposals and adjustments during the year (511)   (35) (50)
Ending balance Right-of-use assets 2,885   2,595 1,975
Accumulated Depreciation | Leasehold land        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 1,591   1,222 915
Charge for the year 309   18 341
Capitalised during the year 182   386 16
Disposals and adjustments during the year (106)   (35) (50)
Ending balance Right-of-use assets 1,976   1,591 1,222
Accumulated Depreciation | Building        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance Right-of-use assets 1,004   753 532
Charge for the year 77   79 129
Capitalised during the year 233   172 92
Disposals and adjustments during the year (405)      
Ending balance Right-of-use assets ₨ 909   ₨ 1,004 ₨ 753