Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2015	Dec. 31, 2014	Dec. 25, 2013
Line of Credit Facility [Line Items]
Maturity date	Mar. 30, 2020
Losses on early extinguishment of debt	$ (225)	$ 33	$ (2,226)
Interest Rate Cap [Member] | Interest Rate Cap 2013-2014 [Member]
Line of Credit Facility [Line Items]
Interest rate cap, basis spread on variable rate (percent)	2.00%
Derivative, notional amount	$ 125,000
Interest Rate Cap [Member] | Interest Rate Cap 2014-2015 [Member]
Line of Credit Facility [Line Items]
Interest rate cap, basis spread on variable rate (percent)	2.00%
Derivative, notional amount	$ 150,000
Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Fair value of interest rate swap liability	$ 1,700
Interest Rate Swap [Member] | Interest Rate Swaps 2015-2018 [Member]
Line of Credit Facility [Line Items]
Average fixed interest rate on interest rate swap	2.63%
Interest Rate Swap [Member] | Interest Rate Swaps 2018-2025 [Member]
Line of Credit Facility [Line Items]
Average fixed interest rate on interest rate swap	3.94%
Interest Rate Swap [Member] | Interest Rate Swaps 2018-2026 [Member]
Line of Credit Facility [Line Items]
Average fixed interest rate on interest rate swap	3.96%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps 2015-2018 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 120,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps 2018-2025 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	120,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps 2018-2026 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	50,000
Senior secured revolver [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 325,000
Basis spread on variable rate (in hundredths)	1.50%
Commitment fee for unused portion of revolving credit facility (in hundredths)	0.20%
Outstanding amount under credit facility	$ 195,000
Availability under the revolving facility	$ 107,100
Weighted-average interest rate (in hundredths)	1.76%	2.17%
Senior secured revolver [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Weighted-average interest rate (in hundredths)	2.31%
Letter of credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 30,000
Outstanding amount under letter of credit	22,900
Secured Debt [Member]
Line of Credit Facility [Line Items]
Losses on early extinguishment of debt	(300)
November 2015 Accelerated Share Repurchase [Member]
Line of Credit Facility [Line Items]
Share repurchase, authorized amount (dollars)	$ 50,000