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Summary of Significant Accounting Policies (Details 4) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Basic and Diluted Net Income Per Share
Net income	$ 19,331	$ 12,793	$ 7,252	$ 4,754	$ 9,386	$ 14,607	$ 8,530	$ 5,280	$ 44,130	$ 37,803	$ 27,641
Weighted-average shares outstanding									29,550	29,485	28,495
Dilutive effect of employee stock options and restricted shares									557	725	859
Diluted weighted-average shares outstanding									30,107	30,210	29,354
Basic income per share									$ 1.49	$ 1.28	$ 0.97
Diluted earnings per share	$ 0.65	$ 0.42	$ 0.24	$ 0.16	$ 0.31	$ 0.48	$ 0.28	$ 0.18	$ 1.47	$ 1.25	$ 0.94

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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