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Stockholders’ Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 07, 2018
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)   1,000,000 1,000,000  
Preferred stock, par value (usd per share)   $ 0.01 $ 0.01  
Preferred stock, shares issued (in shares)   0 0  
Preferred stock, shares outstanding (in shares)   0 0  
Number of shares of common stock purchased   0 581,140 726,347
Repurchased common stock value     $ 34,561 $ 56,436
Treasury stock, shares (in shares)   12,799,790 12,791,503  
Shares issued in ESPP (USD per share)   $ 62.55 $ 62.55  
Alpha        
Class of Stock [Line Items]        
Initial purchase consideration $ 750,000      
Payments to acquire businesses $ 650,000      
Shares issued in acquisition (USD per share) $ 84.92      
Fair value of shares issued for net assets acquired $ 93,268      
Common Stock | Alpha        
Class of Stock [Line Items]        
Shares issued in acquisition (in shares) 1,177,630      
Shares issued in employee stock purchase plan (in shares)   13,465 17,410 3,256