v3.26.1
Foreign currency translation reserve and other reserves - Summary of Movement in Foreign Currency Translation Reserve Attributable to Equity Holders (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 foreign currency translation reserves [line items]        
Balance at the beginning of the year ₨ 830,447   ₨ 751,223 ₨ 781,753
Translation difference related to foreign operations, net 7   0  
Transfer of shares pertaining to Non-controlling interests of subsidiary     0  
Reclassification of foreign currency translation differences on liquidation of subsidiaries to consolidated statement of income 0 $ 0 (41) (198)
Balance at the end of the year 887,877 9,464 830,447 751,223
Foreign currency translation reserve [member]        
Disclosure of foreign currency translation reserves [line items]        
Balance at the beginning of the year 54,500 [1]   47,261 [2] 43,255 [2]
Translation difference related to foreign operations, net 46,377   7,294  
Transfer of shares pertaining to Non-controlling interests of subsidiary 0   (14) [1]  
Reclassification of foreign currency translation differences on liquidation of subsidiaries to consolidated statement of income 0   (41)  
Others (5)   0  
Balance at the end of the year ₨ 100,872 $ 1,075 [3] ₨ 54,500 [1] ₨ 47,261 [2]
[1] Refer to Note 20
[2] Refer to Note 20
[3] Refer to Note 20