XML 62 R45.htm IDEA: XBRL DOCUMENT v3.8.0.1
Summary of Change in Stockholder's Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     $ 1,203,450  
Net Earnings $ 63,362 $ 60,237 118,244 $ 105,581
Balance at End of Period 1,312,673   1,312,673  
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     1  
Balance at End of Period 486   486  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     149,014  
Stock Compensation Expense     7,235  
Cumulative Impact of the Adoption of ASU 2016-09     713  
Shares Redeemed to Settle Employee Taxes     (2,455)  
Purchase and Retirement of Common Stock     (24,902)  
Stock Option Exercises     20,424  
Balance at End of Period 150,029   150,029  
Retained Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance at Beginning of Period     1,061,347  
Dividends Declared to Stockholders     (9,718)  
Cumulative Impact of the Adoption of ASU 2016-09     (713)  
Net Earnings     118,244  
Balance at End of Period 1,169,160   1,169,160  
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     394  
Balance at End of Period $ (7,002)   $ (7,002)