Quarterly Sales and Earnings Data - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 359,591	$ 346,567	$ 348,382	$ 332,238	$ 317,567	$ 146,637	$ 174,890	$ 161,320	$ 1,386,778	$ 800,414	$ 687,787
Gross profit	92,891	97,909	96,031	91,468	73,140	51,646	57,951	52,398	378,299	235,135	231,398
Net income (loss)	$ 7,933	$ 11,458	$ (770)	$ (12,660)	$ (24,907)	$ 22	$ 9,283	$ 8,008	$ 5,961	$ (7,594)	$ 55,458
Earnings Per Share, Basic (in dollars per share)	$ 0.26	$ 0.37	$ (0.03)	$ (0.41)	$ (0.85)	$ 0.00	$ 0.36	$ 0.32	$ 0.19	$ (0.29)	$ 2.23
Earnings Per Share, Diluted (in dollars per share)	$ 0.25	$ 0.37	$ (0.03)	$ (0.41)	$ (0.85)	$ 0.00	$ 0.35	$ 0.31	$ 0.19	$ (0.29)	$ 2.14
Lake Region Medical [Member]
Business Acquisition [Line Items]
Total revenue included from the acquired entity					$ 138,600				$ 802,400	$ 138,600
Spinoff [Member] \| Lake Region Medical [Member]
Business Acquisition [Line Items]
Transaction costs	$ 5,100	$ 5,400	$ 7,900	$ 14,200	$ 57,100	$ 13,000

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