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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]      
Defined benefit pension and other postretirement plans, tax (benefit) provision $ (804) $ (1,802) $ 1,244