Statements of Cash Flows Supplemental Disclosure (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Mar. 11, 2013
Other Significant Noncash Transactions [Line Items]
Shares paid for tax withholding for share based compensation, shares	102,405	56,856	83,077
Shares paid for tax withholding for share based compensation, value	$ 8,000,000	$ 4,500,000	$ 5,100,000
Capital lease obligations incurred	0	300,000	1,200,000
Property, plant and equipment acquired, non-cash financing arrangement		1,400,000
Fixed rate Senior Notes due 2021
Other Significant Noncash Transactions [Line Items]
Debt Instrument, Unamortized Premium				7,600,000
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction				1,300,000
Corporate Joint Venture [Member]
Other Significant Noncash Transactions [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Contribution of Property	$ 3,100,000