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Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 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	Sep. 26, 2015	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income before income taxes										$ 62,971	$ 52,409	$ 32,415
Details of Quarterly Information (Unaudited)
Revenue	$ 206,420	$ 143,609	$ 148,788	$ 117,961	$ 159,342	$ 143,497	$ 139,803	$ 114,204		616,778	556,846	487,401
Gross margin	95,327	69,858	70,033	53,708	76,335	67,889	62,121	51,710		288,926	258,055	221,154
Net income	$ 19,331	$ 12,793	$ 7,252	$ 4,754	$ 9,386	$ 14,607	$ 8,530	$ 5,280		$ 44,130	$ 37,803	$ 27,641
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
Out of Period Adjustment to Revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income before income taxes									$ 800	$ 1,500	$ 700

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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