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Shareholders' Equity - Components of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 26,990	$ 18,257	$ 3,744	$ 20,548	$ 15,791	$ 25,603	$ (778)	$ 24,461	$ 69,539	$ 65,077	$ 51,417
Basic weighted-average shares outstanding									35,256,000	41,212,000	46,154,000
Dilutive effect of stock-based awards									909,000	873,000	748,000
Diluted weighted-average shares outstanding									36,165,000	42,085,000	46,902,000
Net income per share – basic									$ 1.97	$ 1.58	$ 1.11
Net income per share – diluted	$ 0.81	$ 0.52	$ 0.10	$ 0.52	$ 0.39	$ 0.62	$ (0.02)	$ 0.56	$ 1.92	$ 1.55	$ 1.10
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	400,000	600,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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