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Consolidated Statements of Comprehensive Earnings - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]      
Net Earnings $ 152,592 $ 186,853 $ 124,243
Net Actuarial Change in Defined Benefit Plans:      
Unrealized (gain) loss during the period, net of tax expense (benefit) of ($488), ($3,746) and $1,173 613 6,173 (2,399)
Amortization of Net Actuarial Loss, net of tax benefit of $760, $242 and $333 1,271 411 840
Comprehensive Earnings $ 153,250 $ 193,437 $ 122,684