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Financial Instruments - Summary of Financial Instruments Measured at Fair Value (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other Investments- equity securities [Member]    
Disclosure Of Financial Instruments [Line Items]    
Risk adjusted discount rate, Significant unobservable inputs 17.00% 17.00%
Other Investments- equity securities [Member] | Bottom of Range [Member]    
Disclosure Of Financial Instruments [Line Items]    
Forecast annual revenue growth rate, Significant unobservable inputs 4.00% (47.00%)
Forecast EBITDA margin, Significant unobservable inputs (3.00%) (13.00%)
Other Investments- equity securities [Member] | Top of Range [Member]    
Disclosure Of Financial Instruments [Line Items]    
Forecast annual revenue growth rate, Significant unobservable inputs 25.00% 50.00%
Forecast EBITDA margin, Significant unobservable inputs 25.00% 26.00%
Other Liabilities Related to Business Combination [Member]    
Disclosure Of Financial Instruments [Line Items]    
Risk adjusted discount rate, Significant unobservable inputs 10.20% 10.20%
Expected cash flow $ 17,054 $ 16,710