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Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Debt Obligations (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Carrying Value
Debt Obligations:
Revolving credit facility	$ 248,743	$ 265,419
Commercial real estate loan	18,900	19,425
Senior promissory notes	10,000	10,000
Debt obligations	277,643	294,844
Fair Value
Debt Obligations:
Revolving credit facility	248,743	265,419
Commercial real estate loan	19,124	20,541
Senior promissory notes	10,595	10,803
Debt obligations	$ 278,462	$ 296,763

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+ References

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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- Definition

Fair value portion of notes payable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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