Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 26, 2018	Dec. 27, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swaps, net		$ 4,500
Investments		1,709	$ 0
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total, assets		8,469	10,476
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total, assets		11,235	12,663
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total, liabilities		(2,766)	(2,187)
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total, assets		0	0
Recurring [Member] | Deferred Compensation Plan Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred compensation plan investments	[1]	11,235	12,663
Recurring [Member] | Deferred Compensation Plan Investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred compensation plan investments		11,235	12,663
Recurring [Member] | Deferred Compensation Plan Investments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred compensation plan investments		0	0
Recurring [Member] | Deferred Compensation Plan Investments [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred compensation plan investments		0	0
Recurring [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swaps, net	[2]	(4,475)	(2,187)
Recurring [Member] | Interest Rate Swap [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swaps, net		0	0
Recurring [Member] | Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swaps, net		(4,475)	(2,187)
Recurring [Member] | Interest Rate Swap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate swaps, net		0	$ 0
Recurring [Member] | Securities (Assets) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments	[3]	1,709
Recurring [Member] | Securities (Assets) [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments		0
Recurring [Member] | Securities (Assets) [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments		1,709
Recurring [Member] | Securities (Assets) [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments		$ 0

[1] The fair values of our deferred compensation plan investments are based on the closing market prices of the elected investments.

[2] The fair values of our interest rate swaps are based upon Level 2 inputs, which include valuation models as reported by our counterparties. The key inputs for the valuation models are quoted market prices, interest rates and forward yield curves. See Note 12 for details on the interest rate swaps.

[3] The fair value of investments is valued using a readily determinable net asset value per share based on the fair value of the underlying securities. There are no significant redemption restrictions associated with these investments.