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Reconciliation of All Plan Investment Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Plan investment funds managed by insurance companies - Other Funds ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2016 INR (₨)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 INR (₨)
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	₨ 489.2	$ 7.4	₨ 404.0
Realized interest credited to fund	53.3	0.8	0.0
Contribution during the period	61.6	0.9	140.8
Amount paid towards claim	(172.9)	(2.6)	(55.6)
Ending Balance	₨ 431.2	$ 6.5	₨ 489.2

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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