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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Amortization of pension and postretirement benefits plans costs, tax $ 174 $ 173 $ 348 $ 347