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Income Taxes - Reconciliation of Income Taxes at Indian Statutory Income Tax Rate to Income Tax Expense as Reported (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Mar. 31, 2022
INR (₨)
Reconciliation of Estimated Income Taxes to Income Tax Expense as Reported [Line Items]        
Income before income tax expense ₨ 705,459.0 $ 8,465.0 ₨ 662,381.8 ₨ 519,162.2
Statutory income tax rate 25.17% 25.17% 25.17% 25.17%
Expected income tax expense ₨ 177,549.9 $ 2,130.4 ₨ 166,708.3 ₨ 130,662.7
Adjustments to reconcile expected income tax to actual tax expense        
Interest on income tax refund (4,125.0) (49.5) (2,204.9) 0.0
Stock-based compensation (10,645.6) (127.7) 1,645.9 3,493.1
Income subject to rates other than the statutory income tax rate (1,262.0) (15.1) (6.8) (2,347.6)
Special reserve (5,143.2) (61.7)    
Unrecognised tax benefit of earlier years including consequential tax credit pursuant to favourable orders received recognised (80,874.4) (970.4)    
Other, net 2,327.4 27.9 (25.1) 751.0
Income tax expense ₨ 77,827.1 $ 933.9 ₨ 166,117.4 ₨ 132,559.2