XML 15 R4.htm IDEA: XBRL DOCUMENT v3.21.2
Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]    
Defined benefit pension and other postretirement plans, tax expense $ 49 $ 61