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Reconciliation of liabilities from financing activities (Detail) - INR (₨)
₨ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance Beginning ₨ 33,058,029 ₨ 23,979,168 ₨ 23,979,168 ₨ 17,087,593
Proceeds 15,152,741 15,177,433   11,642,842
Repayment (9,948,768) (3,270,951) (2,892,202)  
Movement in short term borrowings 244,305 (467,200) (1,520,339)  
Cash flow 38,506,307 35,418,450   24,317,894
Foreign exchange movement (6,300) 25,472   48,952
Reclass (641,709) (2,395,486) (409,000)  
Others 1,326,019      
Fair value changes 63 9,593 21,322  
Balance Ending 39,184,380 33,058,029 23,979,168 23,979,168
Borrowings        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance Beginning 30,015,190 21,527,989 21,527,989 14,880,190
Proceeds 15,152,741 14,183,762   11,046,000
Repayment (9,389,585) (2,871,383)   (2,530,185)
Movement in short term borrowings 244,305 (467,200)   (1,520,339)
Cash flow 36,022,651 32,373,168   21,875,666
Foreign exchange movement (7,700) 24,021   44,541
Reclass (641,709) (2,395,486)   (409,000)
Fair value changes 900 13,487 16,782  
Balance Ending 35,374,142 30,015,190 21,527,989 21,527,989
Lease liabilities [Member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Balance Beginning 3,042,839 2,451,179 2,451,179 2,207,403
Proceeds 0 993,671   596,842
Repayment (559,183) (399,568)   (362,017)
Movement in short term borrowings 0 0   0
Cash flow 2,483,656 3,045,282   2,442,228
Foreign exchange movement 1,400 1,451   4,411
Others 1,326,019      
Fair value changes (837) (3,894) 4,540  
Balance Ending ₨ 3,810,238 ₨ 3,042,839 ₨ 2,451,179 ₨ 2,451,179