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Financial Instruments - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 INR (₨)
Financial Instruments [Line Items]
Estimated fair values of bank guarantees	₨ 10,085.1	$ 121.0	₨ 7,911.1
Margins in the form of cash and fixed deposit available to the bank to reimburse losses realized under guarantees	298,500.0		222,000.0
Outstanding Undrawn commitments to provide loans and financing to customers	1,175,500.0	14,100.0	372,300.0
Unconditional cancellable commitments	9,108,600.0	109,300.0	7,273,000.0
Guarantees
Financial Instruments [Line Items]
Estimated fair values of bank guarantees	₨ 9,066.2	$ 108.8	₨ 7,041.8
Minimum
Financial Instruments [Line Items]
Remaining tenure of guarantees outstanding	one day
Maximum
Financial Instruments [Line Items]
Remaining tenure of guarantees outstanding	30.3 years

X

- Definition

Financial Instruments [Line Items]

+ References

No definition available.

+ Details

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- Definition

The amount of margin by way cash deposits and fixed deposits available on guarantees.

+ References

No definition available.

+ Details

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X

- Definition

Describe the approximate term of the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ Details

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X

- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

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