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Goodwill and Intangible assets - Intangible Assets, Net (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
--- | --- | --- | ---
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | ₨ 1,417,318.2 | $ 16,590.3 | ₨ 1,417,318.2
Less: Accumulated amortization | 46,438.2 | 543.5 | 21,201.0
Total intangible assets, net | 1,370,880.0 | 16,046.8 | 1,396,117.2
Value of business acquired [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | 221,738.5 | 2,595.6 | 221,738.5
Distribution network [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | 50,570.8 | 592.0 | 50,570.8
Customer Relationship [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | 29,874.9 | 349.6 | 29,874.9
Transferable Development Rights [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | 3,117.7 | 36.5 | 3,117.7
Brand [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | 742,230.7 | 8,688.1 | 742,230.7
Investment management contract [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets | ₨ 369,785.6 | $ 4,328.5 | ₨ 369,785.6

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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