Common Stock - Summary of Increase Decrease In Stockholders Equity (Detail) - shares
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Common Class A      
Class A shares      
Beginning balance (in Shares) 8,158,861 6,735,372 4,191,743
Shares issued from option exercise 4,740    
Converted from Class B shares [1] 866,827 1,423,489 2,543,629
Ending balance 9,030,428 8,158,861 6,735,372
Class B shares      
Beginning balance (in Shares) 8,158,861 6,735,372 4,191,743
Shares issued from option exercise 4,740    
Ending balance 9,030,428 8,158,861 6,735,372
Common Class B      
Class A shares      
Beginning balance (in Shares) 36,159,437 35,188,144 28,819,601
Shares issued from option exercise 9,969,102 2,394,782 8,912,172
Ending balance 45,261,712 36,159,437 35,188,144
Class B shares      
Beginning balance (in Shares) 36,159,437 35,188,144 28,819,601
Shares issued from option exercise 9,969,102 2,394,782 8,912,172
Converted to Class A shares [1] (866,827) (1,423,489) (2,543,629)
Ending balance 45,261,712 36,159,437 35,188,144
[1] The conversion of Class B Common Stock to Class A Common Stock during all periods presented was due to the sale of Class B Common Stock in secondary sale transactions. In such transactions, each share of Class B Common Stock was automatically converted into one share of Class A Common Stock.