Financial Instruments - Summary of Financial Instruments Not Measured at Fair Value (Detail)	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Other Financial Assets and Liabilities [Member]
Disclosure Of Financial Assets And Financial Liabilities [Line Items]
Valuation technique	Discounted cash flows	Discounted cash flows

Disclosure Of Financial Assets and Financial Liabilities [line items]

No definition available.

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