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Summary of Change in Stockholder's Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     $ 1,040,531  
Net Earnings $ 56,387 $ 45,848 161,968 $ 113,429
Balance at End of Period 1,163,575   1,163,575  
Common Stock [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     485  
Purchase and Retirement of Common Stock     (9)  
Issuance of Restricted Stock     1  
Stock Option Exercises     7  
Balance at End of Period 484   484  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     168,969  
Stock Compensation Expense     9,066  
Shares Redeemed to Settle Employee Taxes     (3,084)  
Purchase and Retirement of Common Stock     (60,004)  
Stock Option Exercises     28,676  
Balance at End of Period 143,623   143,623  
Retained Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     882,486  
Dividends Declared to Stockholders     (14,513)  
Net Earnings     161,968  
Balance at End of Period 1,029,941   1,029,941  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     (11,409)  
Change in Funded Status of Pension Plan, net of tax     936  
Balance at End of Period $ (10,473)   $ (10,473)