Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014		Dec. 28, 2013		Dec. 29, 2012
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (10,819)		$ (42,623)
Other comprehensive income (loss) before reclassifications	(38,839)		25,471
Amounts reclassified from AOCI	6,735		6,333
Ending balance	(42,923)		(10,819)		(42,623)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Abstract]
Cost of goods sold	(2,043,719)		(1,862,089)		(1,904,463)
Net change with respect to derivative instruments and hedging activities	(2,499)	[1]	1,713	[1]	255	[1]
Selling, general, and administrative expense	(131,740)		(134,914)		(129,456)
Cumulative Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(462)		(3,032)
Other comprehensive income (loss) before reclassifications	(12,613)		2,570
Amounts reclassified from AOCI	5,999		0
Ending balance	(7,076)		(462)
Unrealized (Losses)/Gains on Derivatives [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	1,546		(167)
Other comprehensive income (loss) before reclassifications	(2,766)		(2,102)
Amounts reclassified from AOCI	267		3,815
Ending balance	(953)		1,546
Unrealized (Losses)/Gains on Derivatives [Member] | Amount Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Abstract]
Cost of goods sold	328		5,618		763
Depreciation expense	0		54		0
Income tax expense	(61)		(1,857)		(294)
Net of tax	267		3,815		469
Noncontrolling interest	0		0		0
Net change with respect to derivative instruments and hedging activities	267		3,815		469
Minimum Pension/OPEB Liability Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(12,158)		(39,527)
Other comprehensive income (loss) before reclassifications	(23,475)		24,851
Amounts reclassified from AOCI	469		2,518
Ending balance	(35,164)		(12,158)
Minimum Pension/OPEB Liability Adjustment [Member] | Amount Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Abstract]
Selling, general, and administrative expense	541		3,844		3,809
Income tax expense	(72)		(1,326)		(1,308)
Net of tax	469		2,518		2,501
Noncontrolling interest	0		0		0
Net of tax and noncontrolling interest	469		2,518		2,501
Unrealized Gains on Equity Investments [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	255		103
Other comprehensive income (loss) before reclassifications	15		152
Amounts reclassified from AOCI	0		0
Ending balance	270		255
Loss Recognized Upon Sale of Business [Member] | Amount Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Abstract]
Gain on sale of assets	5,999		0		0
Income tax benefit	0		0		0
Net of tax	5,999		0		0
Noncontrolling interest	0		0		0
Net of tax and noncontrolling interest	$ 5,999		$ 0		$ 0

[1] Net of taxes of $1,362 in 2014, $(962) in 2013, and $(162) in 2012