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Related Party Transactions - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)	Mar. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Purchase of investments from others	₨ 4,565.9		₨ 53,163.0
Sale of investments from others	5,099.3		3,502.0
Investments of others	425,517.1	$ 6,535.4	335,048.9	₨ 129,121.4
Dividend paid to principal owner	34,490.3	$ 529.7	29,280.9	₨ 24,367.9
Foreign exchange and derivative contracts, notional principal amount	7,827,363.5		7,422,370.0		$ 120,217.4
Bank guarantees	846,958.3		729,008.0		$ 13,008.1
Tier II bonds
Related Party Transaction [Line Items]
Investments of others	250.0		1,200.0
Principal Owner
Related Party Transaction [Line Items]
Fixed assets Purchased from related parties	0.0		0.0
Home loans purchased from principal owner	56,239.4		138,456.5
Dividend paid to principal owner	4,325.3		3,735.5
Foreign exchange and derivative contracts, notional principal amount	59,721.4		6,657.7
Foreign exchange and derivative contracts, mark to market gains	87.7		273.3
Payment of debt securities	21,050.0		23,200.0
Bank guarantees	2.5		1.2
Others
Related Party Transaction [Line Items]
Bank guarantees	₨ 857.4		₨ 13.4

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(3)
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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Amount of cash outflow to acquire investments classified as other.

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The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

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Amount of cash inflow from the sale of investments classified as other.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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