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Income Tax Expense (Parenthetical) (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Components Of Income Tax Expense Benefit [Line Items]
Deferred tax effects of unrealized gains and losses on available for sale securities	₨ (11,425.5)	₨ 6,310.3	₨ (3,771.9)
Reclassification adjustment for net (gain)/loss included in net income, tax	(69.5)	10.0	103.8
Amortization of Intangible Assets
Components Of Income Tax Expense Benefit [Line Items]
Deferred income tax benefits on the amortization of intangible assets	₨ 74.4	₨ 495.6	₨ 747.7

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- Definition

Components Of Income Tax Expense Benefit [Line Items]

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible amortization.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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