XML 18 R4.htm IDEA: XBRL DOCUMENT v3.19.1
Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]      
Defined benefit pension and other postretirement plans, tax (benefit) provision $ (63) $ 476 $ 1,364