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Summary of Change in Stockholder's Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     $ 1,203,450  
Net Earnings $ 101,380 $ 56,387 219,624 $ 161,968
Balance at End of Period 1,416,189   1,416,189  
Common Stock [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     485  
Issuance of Restricted Stock     1  
Purchase and Retirement of Common Stock     (1)  
Stock Option Exercises     2  
Balance at End of Period 487   487  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     149,014  
Stock Compensation Expense     10,890  
Cumulative Impact of the Adoption of ASU 2016-09     713  
Shares Redeemed to Settle Employee Taxes     (2,607)  
Purchase and Retirement of Common Stock     (24,902)  
Stock Option Exercises     23,726  
Balance at End of Period 156,834   156,834  
Retained Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     1,061,347  
Dividends Declared to Stockholders     (14,585)  
Cumulative Impact of the Adoption of ASU 2016-09     (713)  
Net Earnings     219,624  
Balance at End of Period 1,265,673   1,265,673  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     (7,396)  
Change in Funded Status of Pension Plan, net of tax     591  
Balance at End of Period $ (6,805)   $ (6,805)