CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - 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 (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	$ 28,971	$ 500	$ 842	$ 268,327	$ (240,104)	$ 500	$ (94)
Balance at beginning of the period at Dec. 29, 2018	28,971	500	$ 842	268,327	(240,104)	500	(94)
Balance at beginning of the period (shares) at Dec. 29, 2018			84,196,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	8,286			8,286
Common stock issued under employee benefit plans	2,064		$ 6	2,058
Common stock issued under employee benefit plans (in shares)			624,000
Other comprehensive income	60						60
Net income	24,390				24,390
Adoption of new accounting standard	63,952	500	$ 848	278,671	(215,533)	500	(34)
Dividends	(319)				(319)
Balance at end of the period at Jun. 29, 2019	63,952		$ 848	278,671	(215,533)		(34)
Balance at end of the period (shares) at Jun. 29, 2019			84,820,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	35,471	(160)	$ 842	272,332	(237,596)	(160)	(107)
Balance at beginning of the period at Mar. 30, 2019	35,471	(160)	$ 842	272,332	(237,596)	(160)	(107)
Balance at beginning of the period (shares) at Mar. 30, 2019			84,196,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	4,281			4,281
Common stock issued under employee benefit plans	2,064		$ 6	2,058
Common stock issued under employee benefit plans (in shares)			624,000
Other comprehensive income	73						73
Net income	22,223				22,223
Adoption of new accounting standard	63,952	$ (160)	$ 848	278,671	(215,533)	$ (160)	(34)
Balance at end of the period at Jun. 29, 2019	63,952		$ 848	278,671	(215,533)		(34)
Balance at end of the period (shares) at Jun. 29, 2019			84,820,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	63,952		$ 848	278,671	(215,533)		(34)
Adoption of new accounting standard	122,005		868	310,678	(189,545)		4
Balance at beginning of the period at Dec. 28, 2019	122,005		$ 868	310,678	(189,545)		4
Balance at beginning of the period (shares) at Dec. 28, 2019			86,774,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	4,036			4,036
Common stock issued under employee benefit plans	1,397		$ 2	1,395
Common stock issued under employee benefit plans (in shares)			252,000
Common stock withheld related to net share settlement of stock-based compensation	(704)			(704)
Common stock withheld related to net share settlement of stock-based compensation (in shares)			(22,000)
Other comprehensive income	333						333
Net income	41,962				41,962
Adoption of new accounting standard	122,005		$ 868	310,678	(147,583)		337
Balance at end of the period at Jun. 27, 2020	169,029		$ 870	315,405	(147,583)		337
Balance at end of the period (shares) at Jun. 27, 2020			87,004,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	131,647		$ 869	311,993	(181,065)		(150)
Balance at beginning of the period at Mar. 28, 2020	131,647		$ 869	311,993	(181,065)		(150)
Balance at beginning of the period (shares) at Mar. 28, 2020			86,895,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,181			2,181
Common stock issued under employee benefit plans	1,232		$ 1	1,231
Common stock issued under employee benefit plans (in shares)			109,000
Other comprehensive income	487						487
Net income	33,482				33,482
Adoption of new accounting standard	131,647		$ 870	315,405	(147,583)		337
Balance at end of the period at Jun. 27, 2020	169,029		$ 870	315,405	(147,583)		337
Balance at end of the period (shares) at Jun. 27, 2020			87,004,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	$ 169,029		$ 870	$ 315,405	$ (147,583)		$ 337