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Summary of Change in Stockholder's Equity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Stockholders Equity Note [Line Items]    
Balance at Beginning of Period $ 1,040,531  
Net Earnings 45,344 $ 37,762
Balance at End of Period 1,056,443  
Common Stock [Member]    
Stockholders Equity Note [Line Items]    
Balance at Beginning of Period 485  
Purchase and Retirement of Common Stock (6)  
Issuance of Restricted Stock 1  
Stock Option Exercises 4  
Balance at End of Period 484  
Capital in Excess of Par Value [Member]    
Stockholders Equity Note [Line Items]    
Balance at Beginning of Period 168,969  
Stock Compensation Expense 2,593  
Shares Redeemed to Settle Employee Taxes (2,284)  
Purchase and Retirement of Common Stock (39,129)  
Tax Benefit of Stock Option Exercises 3,299  
Stock Option Exercises 10,628  
Balance at End of Period 144,076  
Retained Earnings [Member]    
Stockholders Equity Note [Line Items]    
Balance at Beginning of Period 882,486  
Dividends Declared to Stockholders (4,850)  
Net Earnings 45,344  
Balance at End of Period 922,980  
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 312  
Balance at End of Period $ (11,097)