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Summary of Significant Accounting Policies - Schedule of Intangible Assets And Basis Of Amortization (Detail) | 12 Months Ended
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Mar. 31, 2025
Investment Management Contract [Member] |  |
Schedule Of Intangible Assets [Line Items] |  |
Indefinite Lived Intangible Asset Useful Life | Indefinite |
Amortization method | Not applicable |
Value of Business Acquired (VOBA) [Member] |  |
Schedule Of Intangible Assets [Line Items] |  |
Finite Lived Intangible Assets Useful Life | Life of the underlying contracts |
Amortization method | Constant level basis | [1]
Distribution Network [Member] |  |
Schedule Of Intangible Assets [Line Items] |  |
Useful lives (years) | 17 years |
Amortization method | Straight line |
Customer Relationship [Member] |  |
Schedule Of Intangible Assets [Line Items] |  |
Useful lives (years) | 17 years |
Amortization method | Straight line |
Transferable Development Rights [Member] |  |
Schedule Of Intangible Assets [Line Items] |  |
Useful lives (years) | 8 years |
Amortization method | Straight line |
Brand [Member] |  |
Schedule Of Intangible Assets [Line Items] |  |
Indefinite Lived Intangible Asset Useful Life | Indefinite |
Indefinite Lived Intangible Assets Amortization Method | Not applicable |
[1] | VOBA is amortised on a constant-level basis that approximates straight-line amortization (Refer note 20)

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- Definition Indefinite lived intangible assets useful life. + References No definition available. + Details
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- Definition Indefinite lived intangible assets amortization method. + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent + Details
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