Consolidated Condensed Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income / (Loss)	Accumulated Other Comprehensive Income / (Loss) Cumulative Effect, Period of Adoption, Adjustment
Balance (in shares) at Mar. 30, 2019			58,954,000
Beginning balance at Mar. 30, 2019	$ 1,140,240		$ 59	$ 1,363,677	$ (222,430)		$ (1,066)
Beginning balance (Accounting Standards Update 2016-02) at Mar. 30, 2019		$ (726)				$ (726)
Beginning balance (Accounting Standards Update 2018-02) at Mar. 30, 2019						$ 257		$ (257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	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)			55,000
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(359)			260	(619)
Repurchase and retirement of common stock (in shares)			(888,000)
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			58,121,000
Ending balance at Jun. 29, 2019	1,117,250		$ 58	1,375,719	(258,899)		372
Balance (in shares) at Mar. 28, 2020			58,242,000
Beginning balance at Mar. 28, 2020	1,229,779		$ 58	1,434,871	(201,681)		(3,469)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,209				18,209
Change in unrealized gain (loss) on marketable securities, net of tax	7,496						7,496
Change in foreign currency translation adjustments	1,014						1,014
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)			139,000
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	$ 2,485			3,062	(577)
Repurchase and retirement of common stock (in shares)	0
Stock-based compensation	$ 13,306			13,306
Balance (in shares) at Jun. 27, 2020			58,381,000
Ending balance at Jun. 27, 2020	$ 1,272,289		$ 58	$ 1,451,239	$ (184,049)		$ 5,041