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Period from date of vesting that an equity-based award expires.

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Share based compensation arrangement by share based payment award other than options exercisable weighted average remaining contractual term 1.

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Stock-based compensation, intrinsic value of equity instruments other than options exercised at grant date.

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Stock-based compensation, aggregate intrinsic value of equity instruments other than options outstanding at grant date.

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Share-Based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Grant Date, Aggregate Intrinsic Value

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Share-Based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Grant Date, Aggregate Intrinsic Value

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Share-Based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Grant Date, Intrinsic Value

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ShareBased compensation arrangement by sharebased payment award equity instruments other than options exercisable grant date intrinsic value.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Grant Date, Intrinsic Value

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Aggregate Intrinsic Value

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions				8 Months Ended	12 Months Ended
	Nov. 25, 2021 shares	Oct. 20, 2021 shares	Jul. 31, 2021 shares	Dec. 31, 2022	Mar. 31, 2023 INR (₨) ₨ / shares shares	Mar. 31, 2023 INR (₨) $ / shares ₨ / shares shares	Mar. 31, 2022 INR (₨) ₨ / shares shares	Mar. 31, 2021 INR (₨)	Jun. 30, 2013 INR (₨) shares	Jun. 30, 2010 INR (₨) shares	Jun. 30, 2007 INR (₨) shares	Jan. 31, 2000 INR (₨) shares	Oct. 13, 2022 shares	May 14, 2022 INR (₨) ₨ / shares shares	Jun. 30, 2003 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, intrinsic value of options exercised at grant date					₨ 0.5		₨ 0.0	₨ 0.0
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date					20,891.2		22,077.7	₨ 26,446.8
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date					13.3	₨ 13.3	2.7
Stock-based compensation, aggregate intrinsic value of options outstanding					52,286.4	52,286.4	46,605.0
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date					0.5	0.5	0.5
Stock-based compensation, aggregate intrinsic value of options exercisable					₨ 29,084.2	₨ 29,084.2	₨ 28,340.0
Stock-based compensation, unvested options, outstanding \| shares					86,557,545	86,557,545	92,784,900
Stock-based compensation, unvested options, weighted average exercise price \| ₨ / shares					₨ 1,341.5	₨ 1,341.5	₨ 1,273.6
Stock-based compensation, unvested options, aggregate intrinsic value at grant date					₨ 12.8	₨ 12.8	₨ 2.1
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period					23,202.2	23,202.2	₨ 18,265.0
Stock-based compensation, total estimated compensation cost to be recognized in future periods					₨ 17,245.5	₨ 17,245.5
Equity shares, par value \| ₨ / shares					₨ 1	₨ 1	₨ 1
Employees Stock Option Scheme
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, weighted average period of recognition of total compensation cost not yet recognized (in years)								1 year 14 days
Share-based payment arrangement, expense					₨ 13,132.8		₨ 13,874.5	₨ 10,603.5
Employees Stock Option Scheme \| Plan ''A''
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, equity shares reserved for issuance \| shares												100,000,000
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved												₨ 100.0
Employees Stock Option Scheme \| Plan ''B''
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, equity shares reserved for issuance \| shares															100,000,000
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved												₨ 100.0
Employees Stock Option Scheme \| Plan ''D''
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, equity shares reserved for issuance \| shares											150,000,000
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved											₨ 150.0
Employees Stock Option Scheme \| Plan "E"
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, equity shares reserved for issuance \| shares										200,000,000
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved										₨ 200.0
Employees Stock Option Scheme \| Plan "F"
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, equity shares reserved for issuance \| shares									200,000,000
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved									₨ 200.0
Employees Stock Option Scheme \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, expiration					5 years
Scheme XXVII \| Plan "G"
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, options granted \| shares	238,000				30,480,145
Scheme XXXV \| Plan "G"
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, options granted \| shares		57,466,600
Scheme XXXVI \| Plan "G"
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, options granted \| shares			25,390,600
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, total estimated compensation cost to be recognized in future periods					₨ 2,690.6	₨ 2,690.6
Stock-based compensation, weighted average period of recognition of total compensation cost not yet recognized (in years)					1 year 2 months 15 days
Share-based payment arrangement, expense, tax benefit					₨ 0.0
Stock-based compensation, intrinsic value of equity instruments other than options exercised at grant date					0.0	0.0
Stock-based compensation, aggregate intrinsic value of equity instruments other than options outstanding at grant date					4,037.9	₨ 4,037.9
Aggregate intrinsic value, vested					₨ 4,650.3
Number of shares arising out of units \| shares					2,891,000	2,891,000
Weighted average fair value of RSUs granted during the year \| $ / shares						₨ 1
Share-based payment arrangement, expense					₨ 881.8
Restricted Stock Units (RSUs) [Member] \| Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees' Stock Option Scheme, equity shares reserved for issuance \| shares														100,000,000
Equity shares, par value \| ₨ / shares														₨ 1
Common stock shares reserved for future issuance aggregate par value														₨ 100.0
Share based compensation by share based award vesting period one				4 years
Weighted average fair value of RSUs granted during the year \| ₨ / shares					₨ 1,382.34
Restricted Stock Units (RSUs) [Member] \| Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member] \| Scheme Zero Zero One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares authorized for grant \| shares													2,891,000
Restricted Stock Units (RSUs) 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, aggregate intrinsic value of equity instruments other than options outstanding at grant date					₨ 0.0	₨ 0.0
ShareBased compensation arrangement by sharebased payment award equity instruments other than options exercisable grant date intrinsic value					₨ 0.0	₨ 0.0