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SUPPLEMENTAL BALANCE SHEET INFORMATION Other long-term liabilities (Details) - USD ($)	Mar. 31, 2021	Dec. 30, 2020	Sep. 23, 2020
Other Liabilities Disclosure [Abstract]
Contract with Customer, Liability, Noncurrent	$ 11,965,000	$ 12,151,000
Finance Lease, Liability, Noncurrent	4,056,000	3,586,000
Other Sundry Liabilities, Noncurrent	6,276,000	8,723,000
Other Liabilities, Noncurrent	$ 22,297,000	$ 24,460,000
Deferred lease incentive liabilities			$ 3,359
Deferred social security taxes			$ 2,607

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- Definition

Other Liabilities, Noncurrent, Deferred Lease Incentive

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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