Acquisitions (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Business Acquisition, Pro Forma Information [Abstract]
Sales	$ 1,445,689	$ 1,441,782	$ 677,657
Net income (loss)	$ 2,405	$ (25,865)	$ 37,612
Basic earnings per share (in dollars per share)	$ 0.08	$ (0.87)	$ 1.57
Diluted earnings per share (in dollars per share)	$ 0.08	$ (0.87)	$ 1.49
Lake Region Medical [Member]
Business Acquisition [Line Items]
Acquisition-related costs excluded from earnings	$ 32,300
Debt related costs excluded from earnings	9,500
Nonrecurring amortization expense excluded from earnings	$ 23,000