Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (30,351)	$ (275,786)
Other comprehensive income:
Foreign currency translation adjustment	2,749	919
Amounts arising during the period - net of tax expense
Actuarial gain, net of taxes of $0 and $0, respectively	10,343
Reclassification to net loss - net of expense
Amortization of net loss, net of taxes of $0 and $0, respectively	8,478	5,298
Recognized prior service cost (credits), net of taxes of $0 and $0, respectively	1,808	(1,033)
Total defined benefit pension plans and other postretirement benefits, net of taxes	20,629	4,265
Cash flow hedges:
Unrealized (loss) gain arising during the period, net of tax expense of $0 and $0 respectively	(1,719)	3,658
Reclassification of gain (loss) included in net earnings, net of tax expense of $0 and $0 respectively	1,013	(1,558)
Net unrealized (loss) gain on cash flow hedges, net of tax	(706)	2,100
Total other comprehensive income	22,672	7,284
Total comprehensive loss	$ (7,679)	$ (268,502)