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Fair Value Measurements - Additional Information (Detail)
$ in Thousands
12 Months Ended
Mar. 12, 2021
USD ($)
Investment
Mar. 31, 2021
USD ($)
Investment
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Short-term investments   $ 65,999 $ 116,871  
Impairment of short term investments   2,285    
Unrealized gains on short-term investments   734 1,881 $ 1,127
Unrealized gains reclassified to earnings   $ 1,632 $ 1,327 $ 331
CSAM [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Number of short-term funds invested | Investment 2 2    
Aggregate investment in suspend redemptions $ 110,350      
Payments for (proceeds from) short-term investments $ 75,600      
Short-term investments   $ 110,300    
Short-term investment, Estimated fair value   108,000    
Impairment of short term investments   2,300    
Carrying value of investments   $ 51,000