Consolidated Statements of Stockholders' Equity (Unaudited) - 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. 28, 2019	133,883,000
Balances at Dec. 28, 2019	$ 1,339	$ 762,213	$ 0	$ (433,290)	$ (2,603)	$ 327,659
Net income	0	0	0	8,167	0	8,167
Other comprehensive loss	0	0	0	0	(111)	(111)
Total comprehensive income (loss)						8,056
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes (in shares)	630,000
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes	$ 6	(1,490)	0	0	0	(1,484)
Stock-based compensation expense	$ 0	8,728	0	0	0	8,728
Balances (in shares) at Mar. 28, 2020	134,513,000
Balances at Mar. 28, 2020	$ 1,345	769,451	0	(425,123)	(2,714)	$ 342,959
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
Net income	0	0	0	18,813	0	18,813
Other comprehensive loss	0	0	0	0	(237)	(237)
Total comprehensive income (loss)						18,576
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes (in shares)	472,000
Common stock issued in connection with employee equity incentive plans, net of shares withheld for employee taxes	$ 5	(6,875)	0	0	0	(6,870)
Stock-based compensation expense	0	10,454	0	0	0	10,454
Stock repurchase	$ 0	0	(15,002)	0	0	(15,002)
Retirement of treasury stock (in shares)	(307,000)
Retirement of treasury stock	$ (3)	(14,999)	15,002	0	0	$ 0
Balances (in shares) at Apr. 03, 2021	136,401,000					136,401,000
Balances at Apr. 03, 2021	$ 1,364	$ 759,291	$ 0	$ (367,085)	$ (1,985)	$ 391,585