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Deferred tax assets (DTA) (net) / deferred tax liabilities (DTL) (net) - Summary of Reconciliation of Tax Expense and Accounting Profit Multiplied By Tax Rate (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 Effective Tax Expense Income Reconciliation And Components Of Income Tax Expenses Income [Abstract]        
Accounting profit before income tax ₨ 13,620 $ 145 ₨ 10,034 ₨ 8,142
Tax at the India's tax rate of 25.168% applicable to RPL (March 31, 2025: 25.168%) 3,428 37 2,525 2,540
Disallowance / (Allowance) under section 94B of the Income Tax Act (net) (1,003) (11) 1,763 1,968
Tax rate differences (498) (5) (217) (115)
Unabsorbed depreciation and business losses 934 10 694 1,000
Change in estimates for recoverability of Minimum alternate tax (1) (0) (53) 17
Adjustment of tax relating to earlier periods 137 1 582 (528)
On account of adoption of new tax law        
- MAT credit written off     414 81
- Recognition / reversal of DTA/ DTL     (49) (2)
Effect of tax holidays and other tax exemptions 664 7 (20) (288)
Other non-deductible expenses (426) (5) (196) (678)
Current tax expense reported in the consolidated statement of profit or loss 3,775 40 1,514 981
Deferred tax expense reported in the consolidated statement of profit or loss (540) (6) 3,929 3,014
Tax expense at the effective income tax rate ₨ 3,235 $ 34 ₨ 5,443 ₨ 3,995