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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 26, 2021 | Dec. 27, 2020 | Dec. 29, 2019 | Mar. 29, 2020 | Dec. 30, 2018
Total Fair Value |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 49,896 | $ 62,507 |  |  |
Total Fair Value | Restricted Assets |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | 53,289 | 56,105 |  |  |
Cash, cash equivalents and restricted cash | 103,185 | 118,612 |  |  |
Restricted investments classified as held-to-maturity | 138,084 | 158,296 |  |  |
Deferred compensation investments | 0 | 5,915 |  |  |
Total Fair Value | Restricted Assets | Municipal debt securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 58,505 | 70,723 |  |  |
Total Fair Value | Restricted Assets | Corporate debt securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 78,357 | 85,937 |  |  |
Total Fair Value | Restricted Assets | Agency mortgage-backed securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 152 | 512 |  |  |
Total Fair Value | Restricted Assets | U.S. government and agency securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 1,070 | 1,124 |  |  |
Total Fair Value | Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Goodwill and intangible assets |  |  |  | $ 46,405 |
Goodwill, fair value |  |  |  | 31,705 |
Finite-lived intangible assets, fair value |  |  |  | 14,700 |
Cash, cash equivalents and restricted cash | 103,185 | 118,612 | $ 92,371 |  | $ 102,450
Restricted investments classified as held-to-maturity | 138,084 | 158,296 |  |  |
Deferred compensation investments | 0 | 5,915 |  |  |
Goodwill and intangible asset impairment charge | 0 | (175,189) | $ 0 |  |
Goodwill, impairment charge |  | (140,489) |  |  |
Impairment of finite-lived intangible assets |  | (34,700) |  |  |
Municipal debt securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 58,505 | 70,723 |  |  |
Corporate debt securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 78,357 | 85,937 |  |  |
Agency mortgage-backed securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 152 | 512 |  |  |
U.S. government and agency securities |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 1,070 | 1,124 |  |  |
Restricted Assets | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash, cash equivalents and restricted cash | 103,185 | 118,612 |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Restricted Assets | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash, cash equivalents and restricted cash | 0 | 0 |  |  |
Restricted investments classified as held-to-maturity | 138,084 | 158,296 |  |  |
Restricted Assets | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash, cash equivalents and restricted cash | 0 | 0 |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash and cash equivalents | 49,896 | 62,507 |  |  |
Fair Value, Recurring | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash and cash equivalents | 0 | 0 |  |  |
Fair Value, Recurring | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Cash and cash equivalents | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | 53,289 | 56,105 |  |  |
Deferred compensation investments | 0 | 5,915 |  |  |
Fair Value, Recurring | Restricted Assets | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | 0 | 0 |  |  |
Deferred compensation investments | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | 0 | 0 |  |  |
Deferred compensation investments | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Municipal debt securities | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Municipal debt securities | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 58,505 | 70,723 |  |  |
Fair Value, Recurring | Restricted Assets | Municipal debt securities | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Corporate debt securities | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Corporate debt securities | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 78,357 | 85,937 |  |  |
Fair Value, Recurring | Restricted Assets | Corporate debt securities | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Agency mortgage-backed securities | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | Agency mortgage-backed securities | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 152 | 512 |  |  |
Fair Value, Recurring | Restricted Assets | Agency mortgage-backed securities | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | U.S. government and agency securities | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |  |
Fair Value, Recurring | Restricted Assets | U.S. government and agency securities | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | 1,070 | 1,124 |  |  |
Fair Value, Recurring | Restricted Assets | U.S. government and agency securities | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Restricted investments classified as held-to-maturity | $ 0 | 0 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Goodwill and intangible assets |  |  |  | 221,600 |
Goodwill and intangible asset impairment charge |  | (175,189) |  |  |
Goodwill, impairment charge |  | (140,489) |  |  |
Impairment of finite-lived intangible assets |  | $ (34,700) |  |  |
Fair Value, Nonrecurring [Member] | Quoted prices in active markets for identical assets (level 1) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Goodwill and intangible assets |  |  |  | 0 |
Goodwill, fair value |  |  |  | 0 |
Finite-lived intangible assets, fair value |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Significant other observable inputs (level 2) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Goodwill and intangible assets |  |  |  | 0 |
Goodwill, fair value |  |  |  | 0 |
Finite-lived intangible assets, fair value |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Significant unobservable inputs (level 3) |  |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |  |
Goodwill and intangible assets |  |  |  | 46,405 |
Goodwill, fair value |  |  |  | 31,705 |
Finite-lived intangible assets, fair value |  |  |  | $ 14,700 |

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