Fair Value Measurements Derivative Instruments (Details) $ in Thousands		1 Months Ended	9 Months Ended
		May. 31, 2015 USD ($) cash_flow_hedge	Sep. 27, 2015 USD ($)	Sep. 28, 2014 USD ($)	Dec. 28, 2014 USD ($) cash_flow_hedge
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held | cash_flow_hedge		7			7
Payments for termination of cash flow hedges			$ 7,337	$ 0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments		$ 7,275
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Before Tax			708
Gain (Loss) on Cash Flow Hedge Ineffectiveness, net			$ 0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Payments for termination of cash flow hedges		7,275
Payments for fees to terminate cash flow hedge		62
Interest Rate Swap [Member] | Other Liabilities [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Derivatives, Fair Value [Line Items]
Cash flow hedges	[1]				$ 3,343
Cash Flow Hedging [Member] | Term A Loan, 2018 [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount		350,000			350,000
Cash Flow Hedging [Member] | Term B Loan, 2019 [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount		$ 100,000			$ 100,000

[1] The fair values were based on quoted market prices in markets that are not considered active markets.