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Summary of Change in Stockholder's Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     $ 1,040,531  
Net Earnings $ 60,237 $ 29,819 105,581 $ 67,581
Balance at End of Period 1,098,730   1,098,730  
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     5  
Balance at End of Period 482   482  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     168,969  
Stock Compensation Expense     6,157  
Shares Redeemed to Settle Employee Taxes     (2,965)  
Purchase and Retirement of Common Stock     (60,004)  
Stock Option Exercises     18,481  
Balance at End of Period 130,638   130,638  
Retained Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     882,486  
Dividends Declared to Stockholders     (9,672)  
Net Earnings     105,581  
Balance at End of Period 978,395   978,395  
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     624  
Balance at End of Period $ (10,785)   $ (10,785)