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Consolidated Statements of Comprehensive Earnings (unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]    
Net Earnings $ 37,710 $ 30,101
Net Change in Funded Status of Defined Benefit Plans:    
Amortization of Net Actuarial Loss, net of tax expense of $57 and $83 106 155
Comprehensive Earnings $ 37,816 $ 30,256