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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 26, 2021 | Jun. 26, 2021 | Jun. 27, 2020 | Dec. 26, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |
Payment terms |  | 30 days |  |
Unpaid advanced client billings | $ 19,000 | $ 19,000 |  | $ 16,000
Contract liabilities (customer contract deposits) | 44,981 | $ 44,981 |  | $ 42,244
Percentage of unbilled revenue billed during period |  | 80.00% | 75.00% |
Amount of unbilled revenue billed during period |  | $ 135,000 | $ 122,000 |
Percentage of contract liabilities recognized as revenue during period |  | 75.00% | 75.00% |
Amount of contract liabilities recognized as revenue |  | $ 227,000 | $ 193,000 |
Lease revenue | $ 6,300 | $ 6,300 |  |

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- Definition Contract With Customer, Asset, Percentage Of Amount Reclassified to Receivable + References No definition available. + Details
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- Definition Contract With Customer Liability, Customer Deposits + References No definition available. + Details
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- Definition Contract With Customer, Percentage Of Liabilities, Recognized As Revenue + References No definition available. + Details
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- Definition Contract With Customer, Unpaid Advanced Client Billings + References No definition available. + Details
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- Definition Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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- Definition Amount of sales-type lease revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306 + Details
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