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Stock-based Compensation - Equity Incentive Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 01, 2010
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase of common stock   $ 417,641 $ 224,451 $ 419,291
Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase of common stock (in shares)   3,200,000 2,100,000  
Repurchase of common stock   $ 372,800 $ 196,200  
Equity Incentive Plan Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding, unvested (in shares)   200,000 400,000  
Outstanding, weighted average grant date fair value (in dollars per share)   $ 18.45 $ 15.61  
Stock options outstanding (in shares)   800,000 1,100,000  
Outstanding, weighted average exercise price (in dollars per share)   $ 67.98 $ 60.55  
Restricted stock granted (in shares)   982,447    
Repurchase of common stock (in shares)   300,000    
Repurchase of common stock   $ 42,300    
Restricted Stock and Other Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period 3 years      
Equity Incentive Plan Options | Equity Incentive Plan Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options available for future grant (in shares)   6,000,000 7,700,000  
Stock option expiration period   10 years    
Stock option vesting period   5 years    
Restricted Stock and Other Awards | Equity Incentive Plan Options | Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate fair value of all awards issued   $ 86,200 $ 70,200  
Restricted Stock and Other Awards | Equity Incentive Plan Options | Director | Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period   1 year    
Restricted Stock and Other Awards | Restricted Stock and Other Awards | Officer | Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period   3 years    
Stock issued upon conversion (in shares)   1    
Restricted Stock and Other Awards | Restricted Stock and Other Awards | Director | Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period   3 years    
Restricted Stock Units (RSUs) | Equity Incentive Plan Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period   3 years    
Restricted Stock Units (RSUs) | Equity Incentive Plan Options | Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock granted (in shares)   1,000,000    
Aggregate fair value of all awards issued   $ 97,200