Consolidated Condensed Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income / (Loss)
Balance (in shares) at Mar. 31, 2018		61,960,000
Beginning balance at Mar. 31, 2018	$ 1,161,728	$ 62	$ 1,312,372	$ (139,345)	$ (11,361)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	83,834			83,834
Change in unrealized gain (loss) on marketable securities, net of tax	620				620
Change in defined benefit pension plan liability, net of tax	11,189				11,189
Change in foreign currency translation adjustments	(2,717)				(2,717)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		874,000
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(11,962)		404	(12,366)
Cumulative effect of adoption of ASU 2018-02	0
Repurchase and retirement of common stock (in shares)		(3,712,000)
Repurchase and retirement of common stock	(149,997)	$ (3)		(149,994)
Stock-based compensation	37,106		37,106
Balance (in shares) at Dec. 29, 2018		59,122,000
Ending balance at Dec. 29, 2018	1,129,801	$ 59	1,349,882	(217,871)	(2,269)
Balance (in shares) at Sep. 29, 2018		59,824,000
Beginning balance at Sep. 29, 2018	1,142,975	$ 60	1,338,526	(182,453)	(13,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,933			29,933
Change in unrealized gain (loss) on marketable securities, net of tax	431				431
Change in defined benefit pension plan liability, net of tax	11,189				11,189
Change in foreign currency translation adjustments	(731)				(731)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		707,000
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(10,177)		175	(10,352)
Cumulative effect of adoption of ASU 2018-02	0
Repurchase and retirement of common stock (in shares)		(1,409,000)
Repurchase and retirement of common stock	(55,000)	$ (1)		(54,999)
Stock-based compensation	11,181		11,181
Balance (in shares) at Dec. 29, 2018		59,122,000
Ending balance at Dec. 29, 2018	1,129,801	$ 59	1,349,882	(217,871)	(2,269)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU 2016-02, net of tax	(726)			(726)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	149,340			149,340
Change in unrealized gain (loss) on marketable securities, net of tax	1,946				1,946
Change in foreign currency translation adjustments	(520)				(520)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		1,115,000
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(99)	$ 1	14,210	(14,310)
Cumulative effect of adoption of ASU 2018-02	$ (257)			257	(257)
Repurchase and retirement of common stock (in shares)	(1,400,000)	(1,447,000)
Repurchase and retirement of common stock	$ (70,001)	$ (1)		(70,000)
Stock-based compensation	39,700		39,700
Balance (in shares) at Dec. 28, 2019		58,622,000
Ending balance at Dec. 28, 2019	1,259,880	$ 59	1,417,587	(157,869)	103
Balance (in shares) at Sep. 28, 2019		57,786,000
Beginning balance at Sep. 28, 2019	1,178,625	$ 58	1,392,592	(213,274)	(751)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	68,512			68,512
Change in unrealized gain (loss) on marketable securities, net of tax	(29)				(29)
Change in foreign currency translation adjustments	883				883
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		836,000
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(2,271)	$ 1	10,835	(13,107)
Cumulative effect of adoption of ASU 2018-02	$ 0
Repurchase and retirement of common stock (in shares)	0
Stock-based compensation	$ 14,160		14,160
Balance (in shares) at Dec. 28, 2019		58,622,000
Ending balance at Dec. 28, 2019	$ 1,259,880	$ 59	$ 1,417,587	$ (157,869)	$ 103