Segment Information, Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 2,055,622	$ 2,100,002	$ 2,364,227
Long-lived assets	295,231	280,224	245,910
Reportable Geographical Components [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,400,893	1,519,456	1,752,548
Long-lived assets	223,099	223,398	203,522
Reportable Geographical Components [Member] | United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	197,039	240,823	326,832
Long-lived assets	15,978	19,982	21,766
Reportable Geographical Components [Member] | Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	237,162	97,967	9,807
Long-lived assets	18,928	20,460	0
Reportable Geographical Components [Member] | Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	149,875	162,664	194,495
Long-lived assets	36,722	15,863	19,765
Reportable Geographical Components [Member] | Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	70,653	79,092	80,545
Long-lived assets	$ 504	$ 521	$ 857