Fair Value Measurements (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 26, 2018 USD ($)	Jun. 26, 2018 USD ($) item	Dec. 26, 2017 USD ($)
Fair value of financial instruments
Transfer of asset levels within the fair value hierarchy	$ 0	$ 0
Minimum number of investment funds in rabbi trust for deferred compensation plan \| item		1
Fair value measured on a recurring basis \| Level 1
Fair value of financial instruments
Deferred compensation plan - assets	32,299	$ 32,299	$ 28,754
Deferred compensation plan - liabilities	$ (32,353)	$ (32,353)	$ (28,829)

Amount of transfers of assets measured on a recurring basis levels within the fair value hierarchy.

No definition available.

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- Definition

The minimum number of investment funds held in a rabbi trust that highly compensated employees may defer receipt in a nonqualified deferred compensation plan to contribute such amounts to investment funds in rabbi trust.

+ References

No definition available.

+ Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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