Percentage points added to the reference rate to compute the variable rate on the debt instrument at period end.

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Maximum amount of additional loans that may be issued under the accordion feature of the debt agreement subject to receipt of lender commitments and satisfaction of certain customary conditions.

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Representing fixed charge coverage ratio.

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The length of time the company can extend the maturity date on the debt instrument.

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The increase in the maximum borrowing capacity under the credit facility upon exercise of the accordion feature which is subject to receipt of lender commitments and satisfaction of certain customary conditions.

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The number of periods the company can extend the maturity date of the debt instrument.

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Represents the unsecured leverage ratio that must be maintained as a part of the debt agreement.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of debt outstanding.

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Fixed interest rate related to the interest rate derivative.

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Amount of liability hedged in fair value hedging relationship.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Bank Note Payable, Term Loans Payable and Senior Notes (Details)				12 Months Ended
	Dec. 24, 2020 USD ($)	Oct. 24, 2017 USD ($)	Sep. 27, 2012 USD ($)	Dec. 31, 2020 USD ($) period	Dec. 23, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 02, 2018 USD ($)
Debt Instrument [Line Items]
Repayments of Unsecured Debt				$ 50,000,000
Unsecured term loan				717,323,000		$ 765,733,000
Portion of future LIBOR-based rate risk				17,300,000
Borrowings outstanding				$ 3,500,000
Senior Notes
Debt Instrument [Line Items]
Principal amount of loan		$ 200,000,000
Fixed charge coverage ratio		1.50
Series A Notes
Debt Instrument [Line Items]
Principal amount of loan		$ 116,000,000
Interest rate (as a percent)		3.99%
Series B Notes
Debt Instrument [Line Items]
Principal amount of loan		$ 84,000,000
Interest rate (as a percent)		4.26%
Maximum \| Senior Notes
Debt Instrument [Line Items]
Unsecured leverage ratio		60.00%
Unsecured leverage ratio for significant acquisition		65.00%
BAML Credit Facility \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.50%
BAML Credit Facility \| One month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
BAML Revolver
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)				1.65%		3.67%
Effective interest rate (as a percent)				1.34%
Total available				$ 600,000,000
Number of periods of extension \| period				2
Length of extension period				6 months
Additional borrowing capacity allowed by exercising an accordion feature				$ 500,000,000
Borrowings outstanding				$ 3,500,000		$ 0
Facility fee at period end (as a percent)				0.25%
BAML Revolver \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Facility fee (as a percent)				0.125%
BAML Revolver \| BBB+ \| Baa1
Debt Instrument [Line Items]
Facility fee (as a percent)				0.15%
BAML Revolver \| BBB \| Baa2
Debt Instrument [Line Items]
Facility fee (as a percent)				0.20%
BAML Revolver \| BBB- \| Baa3
Debt Instrument [Line Items]
Facility fee (as a percent)				0.25%
BAML Revolver \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Facility fee (as a percent)				0.30%
BAML Revolver \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				1.20%
BAML Revolver \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.825%
BAML Revolver \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.875%
BAML Revolver \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
BAML Revolver \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.20%
BAML Revolver \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.55%
BAML Revolver \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				0.20%
BAML Revolver \| Base Rate \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.00%
BAML Revolver \| Base Rate \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.00%
BAML Revolver \| Base Rate \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.00%
BAML Revolver \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.20%
BAML Revolver \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.55%
BAML Term Loan
Debt Instrument [Line Items]
Principal amount of loan				$ 400,000,000
Effective interest rate (as a percent)				2.47%
Additional borrowing capacity allowed by exercising an accordion feature				$ 500,000,000
Amount drawn down			$ 400,000,000
BAML Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				1.35%
Fixed rate (as a percent)				1.12%
BAML Term Loan \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.90%
BAML Term Loan \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.95%
BAML Term Loan \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.10%
BAML Term Loan \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.35%
BAML Term Loan \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.75%
BAML Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				0.35%
BAML Term Loan \| Base Rate \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.00%
BAML Term Loan \| Base Rate \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.00%
BAML Term Loan \| Base Rate \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.10%
BAML Term Loan \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.35%
BAML Term Loan \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.75%
JPM Term Loan
Debt Instrument [Line Items]
Principal amount of loan							$ 150,000,000
Repayments of Unsecured Debt	$ 50,000,000
Unsecured term loan					$ 100,000,000
Portion of future LIBOR-based rate risk				$ 100,000,000
Number of periods of extension				2
Length of extension period				6 months
JPM Term Loan \| Hedged portion
Debt Instrument [Line Items]
Portion of future LIBOR-based rate risk				$ 100,000,000
Effective interest rate (as a percent)				3.69%
JPM Term Loan \| Unhedged portion
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)				1.90%		3.54%
Portion of future LIBOR-based rate risk				$ 50,000,000
JPM Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.50%
JPM Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Basis spread on variable rate at period end (as a percent)				1.25%
JPM Term Loan \| LIBOR \| Hedged portion
Debt Instrument [Line Items]
Fixed rate (as a percent)				2.44%
JPM Term Loan \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				85.00%
JPM Term Loan \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				90.00%
JPM Term Loan \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				100.00%
JPM Term Loan \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				125.00%
JPM Term Loan \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				165.00%
JPM Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				0.25%
JPM Term Loan \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				25.00%
JPM Term Loan \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				65.00%
BMO Term Loan
Debt Instrument [Line Items]
Principal amount of loan				$ 220,000,000
Additional loans allowed by exercising an accordion feature				$ 100,000,000
Effective interest rate (as a percent)				3.64%
BMO Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.50%
BMO Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				1.25%
Fixed rate (as a percent)				2.32%
BMO Term Loan \| LIBOR \| Hedged portion
Debt Instrument [Line Items]
Fixed rate (as a percent)				2.39%
BMO Term Loan \| LIBOR \| A- \| A3 \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				85.00%
BMO Term Loan \| LIBOR \| BBB+ \| Baa1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				90.00%
BMO Term Loan \| LIBOR \| BBB \| Baa2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				100.00%
BMO Term Loan \| LIBOR \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				125.00%
BMO Term Loan \| LIBOR \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				165.00%
BMO Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate at period end (as a percent)				0.25%
BMO Term Loan \| Base Rate \| BBB- \| Baa3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				25.00%
BMO Term Loan \| Base Rate \| BBB- \| Baa3 \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				65.00%
BMO Term Loan \| One month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Tranche A Term Loan
Debt Instrument [Line Items]
Principal amount of loan				$ 55,000,000
Tranche B Term Loan
Debt Instrument [Line Items]
Principal amount of loan				$ 165,000,000