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Changes in Accumulated Other Comprehensive Income After Tax (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 INR (₨)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	₨ 870,795.2		₨ 751,567.6
Net unrealized gain/(loss) arising during the period	17,701.5		4,803.2
Amounts reclassified to income	(3,185.2)		(4,114.3)
Balance	1,027,901.1	$ 15,850.5	870,795.2
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	10,707.6		10,259.0
Net unrealized gain/(loss) arising during the period	17,910.7		4,562.9
Amounts reclassified to income	(3,185.2)		(4,114.3)
Balance	25,433.1	392.2	10,707.6
Foreign Currency Translation Reserve
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	807.7		567.4
Net unrealized gain/(loss) arising during the period	(209.2)		240.3
Amounts reclassified to income	0.0		0.0
Balance	598.5	9.2	807.7
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	11,515.3		10,826.4
Balance	₨ 26,031.6	$ 401.4	₨ 11,515.3

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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