Consolidated Condensed Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income / (Loss)
Balance (in shares) at Mar. 31, 2018		61,960
Balance at Mar. 31, 2018	$ 1,161,728	$ 62	$ 1,312,372	$ (139,345)	$ (11,361)
Net income (loss)	(4,272)			(4,272)
Change in unrealized gain (loss) on marketable securities, net of tax	33				33
Change in foreign currency translation adjustments	(2,190)				(2,190)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		59
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(997)		60	(1,057)
Cumulative effect of adoption of ASU 2018-02	0
Repurchase and retirement of common stock (in shares)		(1,029)
Repurchase and retirement of common stock	(40,000)	$ (1)		(39,999)
Stock-based compensation	12,794		12,794
Balance (in shares) at Jun. 30, 2018		60,990
Balance at Jun. 30, 2018	1,127,096	$ 61	1,325,226	(184,673)	(13,518)
Cumulative effect of adoption of ASU 2016-02, net of tax	(726)			(726)
Balance (in shares) at Mar. 30, 2019		58,954
Balance at Mar. 30, 2019	1,140,240	$ 59	1,363,677	(222,430)	(1,066)
Net income (loss)	4,618			4,618
Change in unrealized gain (loss) on marketable securities, net of tax	1,671				1,671
Change in foreign currency translation adjustments	24				24
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		55
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(359)		260	(619)
Cumulative effect of adoption of ASU 2018-02	(257)			257	(257)
Repurchase and retirement of common stock (in shares)		(888)
Repurchase and retirement of common stock	(40,000)	$ (1)		(39,999)
Stock-based compensation	11,782		11,782
Balance (in shares) at Jun. 29, 2019		58,121
Balance at Jun. 29, 2019	$ 1,117,250	$ 58	$ 1,375,719	$ (258,899)	$ 372