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Commitments and Contingencies - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)
Loss Contingencies [Line Items]
Capital commitments, estimated amounts of contracts remaining to be executed on the capital account	₨ 12,895.7		₨ 12,756.9
Additional operating lease commitments with leases which have not yet commenced	187.8
Operating lease expense	₨ 12,820.3	$ 175.3	11,692.3
Minimum [Member]
Loss Contingencies [Line Items]
Additional operating lease commitments with leases which have not yet commenced, lease term	9 years
Maximum [Member]
Loss Contingencies [Line Items]
Additional operating lease commitments with leases which have not yet commenced, lease term	15 years
Indirect Taxes And Other Claims
Loss Contingencies [Line Items]
Contingencies, estimated possible loss	₨ 8,437.8		₨ 10,203.1

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- Definition

Lessee operating lease lease not yet commenced contract commitments.

+ References

No definition available.

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- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
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+ References

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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-SubTopic 10
-Section 50
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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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- Definition

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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