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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 ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 INR (₨)
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	₨ 864.5	$ 10.4	₨ 779.8
On merger of eHDFC	25.1	0.3	0.0
Realized interest credited to fund	64.0	0.8	54.8
Contribution during the period	70.9	0.9	148.6
Amount paid towards claim	(165.4)	(2.0)	(118.7)
Ending Balance	₨ 859.1	$ 10.4	₨ 864.5

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- Definition

Fair value measurement with significant unobservable input reconciliation recurring basis assets acquired on merger.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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