Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net Income (Loss) Attributable to Parent	$ (13,846)	$ (30,945)	$ 46,943	$ (122,155)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment	11,074	(7,725)	2,164	(21,211)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	0	0	4,898	0
Actuarial gain, net of taxes of $0	0	0	(118,073)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	6,486	1,676	14,044	5,028
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	(1,459)	(2,075)	46,044	(6,225)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	5,027	(399)	(62,883)	(1,197)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	4,581	47	4,921	787
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(80)	(327)	(1,817)	(1,138)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	4,501	(280)	3,104	(351)
Other Comprehensive Income (Loss), Net of Tax	20,602	(8,404)	(57,615)	(22,759)
Total comprehensive income	$ 6,756	$ (39,349)	$ (10,672)	$ (144,914)