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Shareholders' Deficit - Components of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 24,093	$ 28,054	$ 4,280	$ 25,418	$ 26,990	$ 18,257	$ 3,744	$ 20,548	$ 81,845	$ 69,539	$ 65,077
Basic weighted-average shares outstanding									29,472,000	35,256,000	41,212,000
Dilutive effect of stock-based awards									883,000	909,000	873,000
Diluted weighted-average shares outstanding									30,355,000	36,165,000	42,085,000
Net income per share – basic									$ 2.78	$ 1.97	$ 1.58
Net income per share – diluted	$ 0.82	$ 0.94	$ 0.14	$ 0.80	$ 0.81	$ 0.52	$ 0.10	$ 0.52	$ 2.70	$ 1.92	$ 1.55
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount									200,000	200,000	400,000

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