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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,901			53,901
Change in unrealized gain (loss) on marketable securities, net of tax	189				189
Change in foreign currency translation adjustments	(1,986)				(1,986)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		167
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(1,785)		229	(2,014)
Cumulative effect of adoption of ASU 2018-02	0
Repurchase and retirement of common stock (in shares)		(2,303)
Repurchase and retirement of common stock	(94,997)	$ (2)		(94,995)
Stock-based compensation	25,925		25,925
Balance (in shares) at Sep. 29, 2018		59,824
Balance at Sep. 29, 2018	1,142,975	$ 60	1,338,526	(182,453)	(13,158)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	58,173			58,173
Change in unrealized gain (loss) on marketable securities, net of tax	156				156
Change in foreign currency translation adjustments	204				204
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		108
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	(788)		169	(957)
Cumulative effect of adoption of ASU 2018-02	0
Repurchase and retirement of common stock (in shares)		(1,274)
Repurchase and retirement of common stock	(54,997)	$ (1)		(54,996)
Stock-based compensation	13,131		13,131
Balance (in shares) at Sep. 29, 2018		59,824
Balance at Sep. 29, 2018	1,142,975	$ 60	1,338,526	(182,453)	(13,158)
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
Balance at Mar. 30, 2019	1,140,240	$ 59	1,363,677	(222,430)	(1,066)
Balance (in shares) at Jun. 29, 2019		58,121
Balance at Jun. 29, 2019	1,117,250	$ 58	1,375,719	(258,899)	372
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80,828			80,828
Change in unrealized gain (loss) on marketable securities, net of tax	1,975				1,975
Change in foreign currency translation adjustments	(1,403)				(1,403)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		279
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	2,172		3,375	(1,203)
Cumulative effect of adoption of ASU 2018-02	$ (257)			257	(257)
Repurchase and retirement of common stock (in shares)	(1,400)	(1,447)
Repurchase and retirement of common stock	$ (70,001)	$ (1)		(70,000)
Stock-based compensation	25,540		25,540
Balance (in shares) at Sep. 28, 2019		57,786
Balance at Sep. 28, 2019	1,178,625	$ 58	1,392,592	(213,274)	(751)
Balance (in shares) at Jun. 29, 2019		58,121
Balance at Jun. 29, 2019	1,117,250	$ 58	1,375,719	(258,899)	372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,210			76,210
Change in unrealized gain (loss) on marketable securities, net of tax	304				304
Change in foreign currency translation adjustments	(1,427)				(1,427)
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes (in shares)		224
Issuance of stock under stock option plans and other, net of shares withheld for employee taxes	2,531		3,115	(584)
Cumulative effect of adoption of ASU 2018-02	$ 0
Repurchase and retirement of common stock (in shares)	(600)	(559)
Repurchase and retirement of common stock	$ (30,001)			(30,001)
Stock-based compensation	13,758		13,758
Balance (in shares) at Sep. 28, 2019		57,786
Balance at Sep. 28, 2019	$ 1,178,625	$ 58	$ 1,392,592	$ (213,274)	$ (751)