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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Beginning balance at Mar. 31, 2016	$ 744,336	$ 530	$ 445,182	$ (5,163)	$ (23,525)	$ 327,312
Common stock (in shares) at Mar. 31, 2016		53,066,000
Treasury stock (in shares) at Mar. 31, 2016				306,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	8,148		8,148
Exercise of stock options	$ 4,028	$ 2	4,026
Exercise of stock options (in shares)	126,800	127,000
Issuance of shares related to restricted stock		$ 1	(1)
Issuance of shares related to restricted stock (in shares)		94,000
Treasury share repurchases	$ (1,431)			$ (1,431)
Net (loss) income	69,395					69,395
Treasury share repurchases (in shares)				26,000
Excess tax benefits from share-based awards	900		900
Comprehensive loss	66,568
Common stock (in shares) at Mar. 31, 2017		53,287,000
Treasury stock (in shares) at Mar. 31, 2017				332,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive loss	(2,827)				(2,827)
Ending balance at Mar. 31, 2017	822,549	$ 533	458,255	$ (6,594)	(26,352)	396,707
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	8,909		8,909
Exercise of stock options	$ 1,620	$ 0	1,620
Exercise of stock options (in shares)	55,700	56,000
Issuance of shares related to restricted stock		$ 1	(1)
Issuance of shares related to restricted stock (in shares)		53,000
Treasury share repurchases	$ (1,075)			$ (1,075)
Net (loss) income	339,570					339,570
Treasury share repurchases (in shares)				21,000
Comprehensive loss	$ 346,607
Common stock (in shares) at Mar. 31, 2018		53,396,000
Treasury stock (in shares) at Mar. 31, 2018	353,000			353,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive loss	$ 7,037				7,037
Ending balance at Mar. 31, 2018	1,178,610	$ 534	468,783	$ (7,669)	(19,315)	736,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	7,438		7,438
Exercise of stock options	$ 2,931	$ 0	2,931
Exercise of stock options (in shares)	97,700	98,000
Issuance of shares related to restricted stock		$ 2	(2)
Issuance of shares related to restricted stock (in shares)		176,000
Treasury share repurchases	$ (52,259)			$ (52,259)
Net (loss) income	$ (35,800)
Treasury share repurchases (in shares)	1,449,750			1,518,000
Comprehensive loss	$ (42,232)
Common stock (in shares) at Mar. 31, 2019		53,670,000
Treasury stock (in shares) at Mar. 31, 2019	1,871,000			1,871,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive loss	$ (6,432)				(6,432)
Ending balance at Mar. 31, 2019	$ 1,095,831	$ 536	$ 479,150	$ (59,928)	$ (25,747)	$ 701,820

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration