Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 30, 2017	123,895,000
Balances at Dec. 30, 2017	$ 1,239	$ 695,768	$ 0	$ (450,461)	$ (1,452)	$ 245,094
Net income (loss)	0	0	0	(26,322)	0	(26,322)
Other comprehensive income (loss)	0	0	0	0	(879)	(879)
Comprehensive income (loss)						(27,201)
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes (in shares)	5,833,000
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes	$ 58	26,860	0	0	0	26,918
Stock-based compensation expense	$ 0	13,646	0	0	0	13,646
Balances (in shares) at Dec. 29, 2018	129,728,000
Balances at Dec. 29, 2018	$ 1,297	736,274	0	(476,783)	(2,331)	258,457
Net income (loss)	0	0	0	43,493	0	43,493
Other comprehensive income (loss)	0	0	0	0	(272)	(272)
Comprehensive income (loss)						43,221
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes (in shares)	4,155,000
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes	$ 42	7,040	0	0	0	7,082
Stock-based compensation expense	$ 0	18,899	0	0	0	$ 18,899
Balances (in shares) at Dec. 28, 2019	133,883,000					133,883,000
Balances at Dec. 28, 2019	$ 1,339	762,213	0	(433,290)	(2,603)	$ 327,659
Net income (loss)	0	0	0	47,392	0	47,392
Other comprehensive income (loss)	0	0	0	0	855	855
Comprehensive income (loss)						48,247
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes (in shares)	2,738,000
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes	$ 27	(16,889)	0	0	0	(16,862)
Stock-based compensation expense	0	40,372	0	0	0	40,372
Stock repurchase	0	0	(14,989)	0	0	(14,989)
Retirement of treasury stock	(385)
Retirement of treasury stock	$ (4)	(14,985)	14,989	0	0	$ 0
Balances (in shares) at Jan. 02, 2021	136,236,000					136,236,000
Balances at Jan. 02, 2021	$ 1,362	$ 770,711	$ 0	$ (385,898)	$ (1,748)	$ 384,427