Acquisitions (Purchase Price Allocation of National Envelope) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Sep. 16, 2013
Business Acquisition [Line Items]
Gain on bargain purchase	$ 0	$ 17,262	$ 0
National Envelope Acquisition [Member]
Business Acquisition [Line Items]
Property, plant and equipment				53,108
Other intangible assets				4,430
Total assets acquired				57,538
Accounts payable				1,015
Accrued compensation and related liabilities				1,210
Other current liabilities				1,453
Note payable				2,536
Total liabilities assumed				6,214
Net assets acquired				51,324
Cost of the acquisition of certain assets of National				34,062
Gain on bargain purchase				$ 17,262