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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net Earnings $ 56,387 $ 45,848 $ 161,968 $ 113,429
Change in Funded Status of Defined Benefit Plans:        
Amortization of Net Actuarial Loss 500 506 1,500 1,522
Tax Expense (188) (188) (564) (564)
Comprehensive Earnings $ 56,699 $ 46,166 $ 162,904 $ 114,387