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Commitments and Contingencies - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
Loss Contingencies [Line Items] |  |  |
Capital commitments, estimated amounts of contracts remaining to be executed on the capital account | ₨ 21,115.5 |  | ₨ 12,895.7
Additional operating lease commitments with leases which have not yet commenced | 1,731.9 |  |
Operating lease expense | ₨ 14,295.7 | $ 188.4 | 12,820.3
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 | ₨ 9,226.0 |  | ₨ 10,203.1

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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) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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