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Financial Instruments - Level 3 Fair Value Sensitivity Analysis - Additional Information (Detail)
12 Months Ended
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%