Business Segment and Geographic Information (Geographic Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to unaffiliated clients	$ 1,297,662	$ 1,165,528	$ 1,129,530
Long-lived assets	676,797	738,146	765,679
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to unaffiliated clients	588,531	551,340	534,817
Long-lived assets	386,624	447,829	476,927
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to unaffiliated clients	446,263	353,688	341,550
Long-lived assets	153,203	130,855	122,351
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to unaffiliated clients	163,490	162,404	160,004
Long-lived assets	95,272	109,811	124,302
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to unaffiliated clients	49,921	59,370	77,707
Long-lived assets	23,896	30,589	39,642
Other Non-U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to unaffiliated clients	49,457	38,726	15,452
Long-lived assets	$ 17,802	$ 19,062	$ 2,457