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Financial Instruments - Level 3 Fair Value Sensitivity Analysis - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Other Investments- equity securities [Member] |  |
Disclosure of Fair Value Measurement [Line Items] |  |
Equity instruments basis points | 1.00% | 1.00%
Other Liabilities Related to Business Combination [Member] |  |
Disclosure of Fair Value Measurement [Line Items] |  |
Change in other liabilities related to business combination | 1.00% | 1.00%

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- Definition Disclosure of fair value measurement line items. + References No definition available. + Details
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- Details
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- Details
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