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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, 2023 INR (₨)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 INR (₨)	Mar. 31, 2021 INR (₨)
Reconciliation of Estimated Income Taxes to Income Tax Expense as Reported [Line Items]
Income before income tax expense	₨ 662,381.8	$ 8,058.9	₨ 519,162.2	₨ 439,826.5
Statutory income tax rate	25.17%	25.17%	25.17%	25.17%
Expected income tax expense	₨ 166,708.3	$ 2,028.3	₨ 130,662.7	₨ 110,695.5
Adjustments to reconcile expected income tax to actual income tax expense
Interest on income tax refund	(2,204.9)	(26.8)	0.0	0.0
Nondeductible stock-based compensation	1,645.9	20.0	3,493.1	2,668.7
Income subject to rates other than the statutory income tax rate	(6.8)	(0.1)	(2,347.6)	0.0
Income exempt from income taxes	0.0	0.0	0.0	(62.3)
Others, net	(25.1)	(0.3)	751.0	518.2
Income tax expense	₨ 166,117.4	$ 2,021.1	₨ 132,559.2	₨ 113,820.1

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Interest On Income Tax Refund net of tax.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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