Stockholders' Deficit - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Balance	$ (818,853)	$ (781,264)
Total other comprehensive income	22,672	7,284
Balance	(826,226)	(1,047,381)
Currency Translation Adjustment [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Balance	(42,161)	(62,045)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	2,749	919
Total other comprehensive income	2,749	919
Balance	(39,412)	(61,126)
Unrealized Gains and Losses on Derivative Instruments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Balance	1,015	(4,303)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(1,719)	3,658
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	1,013	(1,558)
Total other comprehensive income	(706)	2,100
Balance	309	(2,203)
Defined Benefit Pension Plans and Other Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Balance	(489,046)	(680,100)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	10,343
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	10,286	4,265
Total other comprehensive income	20,629	4,265
Balance	(468,417)	(675,835)
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Balance	(530,192)	(746,448)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	11,373	4,577
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	11,299	2,707
Total other comprehensive income	22,672	7,284
Balance	$ (507,520)	$ (739,164)