Condensed Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Capital in Excess of Par Value [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment
Balance at Mar. 31, 2019	[1]	$ (573,313)	$ (225)	$ 52	$ 867,545	$ (159,154)	$ (516,011)	$ (765,745)	$ (225)
Balance (in shares) at Mar. 31, 2019	[1]			49,887,268
Net income (loss)	[1]	$ 16,924						16,924
Accounting Standards Update [Extensible List]	[1]	us-gaap:AccountingStandardsUpdate201602Member
Foreign currency translation adjustment	[1]	$ (2,683)					(2,683)
Pension liability adjustment, net of income taxes	[1]	2,573					2,573
Change in fair value of foreign currency hedges, net of income taxes	[1]	(319)					(319)
Cash dividends	[1]	(1,998)						(1,998)
Share-based compensation	[1]	1,903			(7,631)	9,534
Share-based compensation, shares	[1]			154,802
Repurchase of shares for share-based compensation minimum tax obligation	[1]	(1,043)				(1,043)
Repurchase of shares for share-based compensation minimum tax obligation, shares	[1]			(51,406)
Employee stock purchase plan	[1]	262			(634)	896
Employee stock purchase plan, shares	[1]			14,489
Balance at Jun. 30, 2019	[1]	(557,919)		$ 52	859,280	(149,767)	(516,440)	(751,044)
Balance (in shares) at Jun. 30, 2019	[1]			50,005,153
Balance at Mar. 31, 2019	[1]	(573,313)	$ (225)	$ 52	867,545	(159,154)	(516,011)	(765,745)	$ (225)
Balance (in shares) at Mar. 31, 2019	[1]			49,887,268
Foreign currency translation adjustment	[1]	(8,910)
Balance at Sep. 30, 2019	[1]	(590,824)		$ 52	858,030	(145,496)	(592,597)	(710,813)
Balance (in shares) at Sep. 30, 2019	[1]			50,074,523
Balance at Jun. 30, 2019	[1]	(557,919)		$ 52	859,280	(149,767)	(516,440)	(751,044)
Balance (in shares) at Jun. 30, 2019	[1]			50,005,153
Net income (loss)	[1]	42,234						42,234
Foreign currency translation adjustment	[1]	(6,227)					(6,227)
Pension liability adjustment, net of income taxes	[1]	(68,852)					(68,852)
Change in fair value of foreign currency hedges, net of income taxes	[1]	(1,078)					(1,078)
Cash dividends	[1]	(2,003)						(2,003)
Share-based compensation	[1]	2,804			(850)	3,654
Share-based compensation, shares	[1]			59,938
Repurchase of shares for share-based compensation minimum tax obligation	[1]	(5)				(5)
Repurchase of shares for share-based compensation minimum tax obligation, shares	[1]			(764)
Employee stock purchase plan	[1]	222			(400)	622
Employee stock purchase plan, shares	[1]			10,196
Balance at Sep. 30, 2019	[1]	(590,824)		$ 52	858,030	(145,496)	(592,597)	(710,813)
Balance (in shares) at Sep. 30, 2019	[1]			50,074,523
Balance at Mar. 31, 2020	[1]	(781,264)		$ 52	804,830	(36,217)	(746,448)	(803,481)
Balance (in shares) at Mar. 31, 2020	[1]			51,858,089
Net income (loss)	[1]	(275,786)						(275,786)
Foreign currency translation adjustment	[1]	919					919
Pension liability adjustment, net of income taxes	[1]	4,265					4,265
Change in fair value of foreign currency hedges, net of income taxes	[1]	2,100					2,100
Share-based compensation	[1]	2,621			(6,670)	9,291
Share-based compensation, shares	[1]			158,274
Repurchase of shares for share-based compensation minimum tax obligation	[1]	(474)				(474)
Repurchase of shares for share-based compensation minimum tax obligation, shares	[1]			(50,955)
Employee stock purchase plan	[1]	238			(1,974)	2,212
Employee stock purchase plan, shares	[1]			36,802
Balance at Jun. 30, 2020	[1]	(1,047,381)		$ 52	796,186	(25,188)	(739,164)	(1,079,267)
Balance (in shares) at Jun. 30, 2020	[1]			52,002,210
Balance at Mar. 31, 2020	[1]	(781,264)		$ 52	804,830	(36,217)	(746,448)	(803,481)
Balance (in shares) at Mar. 31, 2020	[1]			51,858,089
Foreign currency translation adjustment		8,201
Balance at Sep. 30, 2020	[1]	(1,064,357)		$ 52	794,619	(20,886)	(725,386)	(1,112,756)
Balance (in shares) at Sep. 30, 2020	[1]			52,078,690
Balance at Jun. 30, 2020	[1]	(1,047,381)		$ 52	796,186	(25,188)	(739,164)	(1,079,267)
Balance (in shares) at Jun. 30, 2020	[1]			52,002,210
Net income (loss)	[1]	(33,489)						(33,489)
Foreign currency translation adjustment	[1]	7,282					7,282
Pension liability adjustment, net of income taxes	[1]	4,265					4,265
Change in fair value of foreign currency hedges, net of income taxes	[1]	2,231					2,231
Share-based compensation	[1]	2,536			(446)	2,982
Share-based compensation, shares	[1]			54,313
Repurchase of shares for share-based compensation minimum tax obligation	[1]	(21)				(21)
Repurchase of shares for share-based compensation minimum tax obligation, shares	[1]			(2,246)
Employee stock purchase plan	[1]	219			(1,122)	1,341
Employee stock purchase plan, shares	[1]			24,413
Balance at Sep. 30, 2020	[1]	$ (1,064,357)		$ 52	$ 794,619	$ (20,886)	$ (725,386)	$ (1,112,756)
Balance (in shares) at Sep. 30, 2020	[1]			52,078,690

[1] As adjusted; refer to Note 1.