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Reclassification Out of Accumulated Other Comprehensive Income (OCI) by Income line Item and the Related Tax Effect (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)
Available for sale securities:
Realized (gain)/loss on sales of available for sale securities, net	₨ 10,853.2	$ 166.7	₨ 9,606.2	₨ 5,646.0
Other than temporary impairment losses on available for sale securities	(149.1)	(2.3)	(13.4)	₨ (54.9)
Net of tax	(8,455.1)		(3,185.2)
Available for Sale Securities
Available for sale securities:
Net of tax	(8,455.1)		(3,185.2)
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities
Available for sale securities:
Realized (gain)/loss on sales of available for sale securities, net	(13,145.7)	(201.9)	(4,884.3)
Other than temporary impairment losses on available for sale securities	149.1	2.3	13.4
Total before tax	(12,996.6)	(199.6)	(4,870.9)
Income tax	4,541.5	69.7	1,685.7
Net of tax	₨ (8,455.1)	$ (129.9)	₨ (3,185.2)

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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