Statement of Cash Flow Supplemental Disclosure (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Mar. 29, 2014	Sep. 26, 2015	Sep. 27, 2014
Other Significant Noncash Transactions [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation			12,847	93,505
Shares Paid For Tax Withholding For Share Based Compensation, Value			$ 900,000	$ 7,400,000
Capital Lease Obligations Incurred			$ 0	$ 0
Corporate Joint Venture [Member]
Other Significant Noncash Transactions [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Contribution of Property		$ 3,100,000
Software and Software Development Costs [Member]
Other Significant Noncash Transactions [Line Items]
Fair Value of Assets Acquired	$ 2,500,000