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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Losses [Member]
Beginning balance at Mar. 31, 2014 $ 831,499 $ 501 $ 253,524 $ 582,957 $ (5,483)
Net Earnings 186,853     186,853  
Stock Option Exercises and Restricted Share Vesting 4,311 1 4,310    
Tax Benefit-Stock Option Exercise 5,743   5,743    
Dividends to Stockholders (20,093)     (20,093)  
Stock Compensation Expense 13,030   13,030    
Shares Redeemed to Settle Employee Taxes (4,166)   (4,166)    
Unfunded Pension Liability, net of tax (6,584)       (6,584)
Ending Balance at Mar. 31, 2015 1,010,593 502 272,441 749,717 (12,067)
Net Earnings 152,592     152,592  
Stock Option Exercises and Restricted Share Vesting 2,866 2 2,864    
Tax Benefit-Stock Option Exercise 4,102   4,102    
Purchase and Retirement of Common Stock (123,530) (19) (123,511)    
Dividends to Stockholders (19,823)     (19,823)  
Stock Compensation Expense 17,346   17,346    
Shares Redeemed to Settle Employee Taxes (4,273)   (4,273)    
Unfunded Pension Liability, net of tax 658       658
Ending Balance at Mar. 31, 2016 1,040,531 485 168,969 882,486 (11,409)
Net Earnings 198,219     198,219  
Stock Option Exercises and Restricted Share Vesting 22,108 8 22,100    
Tax Benefit-Stock Option Exercise 10,349   10,349    
Purchase and Retirement of Common Stock (60,013) (9) (60,004)    
Dividends to Stockholders (19,358)     (19,358)  
Stock Compensation Expense 12,069 1 12,068    
Shares Redeemed to Settle Employee Taxes (4,468)   (4,468)    
Unfunded Pension Liability, net of tax 4,013       4,013
Ending Balance at Mar. 31, 2017 $ 1,203,450 $ 485 $ 149,014 $ 1,061,347 $ (7,396)