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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 26, 2021 | Dec. 25, 2022 | Dec. 27, 2020
Total Fair Value |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | $ 61,885 |  | $ 72,054 |
Total Fair Value | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 37,421 |  | 63,577 |
Cash, cash equivalents and restricted cash | 99,306 |  | 135,631 |
Restricted investments classified as held-to-maturity | 120,913 |  | 119,525 |
Total Fair Value | Restricted Assets | Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 31,804 |  | 42,431 |
Total Fair Value | Restricted Assets | Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 74,912 |  | 76,097 |
Total Fair Value | Restricted Assets | Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 13,235 |  | 48 |
Total Fair Value | Restricted Assets | U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 962 |  | 949 |
Cash, cash equivalents and restricted cash | 99,306 | $ 103,185 | 135,631 | $ 118,612
Restricted investments classified as held-to-maturity | 120,913 |  | 119,525 |
Goodwill | 84,114 | 94,538 | 93,784 |
Goodwill, impairment charge | (8,885) | (8,900) |  |
Indefinite-lived trade name/trademarks | $ 5,400 |  | 6,000 |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] | Goodwill and intangible asset impairment charge |  |  |
PeopleScout MSP |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Goodwill | $ 9,700 |  |  |
Goodwill, impairment charge |  | (8,900) |  |
PeopleScout |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Goodwill | 23,549 | 32,953 | 32,199 |
Goodwill, impairment charge | (8,885) |  |  |
PeopleManagement |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Goodwill | 1,491 | $ 1,491 | 1,491 |
Goodwill, impairment charge | 0 |  |  |
Indefinite-lived trade name/trademarks | 3,900 |  |  |
Impairment charge | 600 |  |  |
Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 31,804 |  | 42,431 |
Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 74,912 |  | 76,097 |
Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 13,235 |  | 48 |
U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 962 |  | 949 |
Restricted Assets | Quoted prices in active markets for identical assets (level 1) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash, cash equivalents and restricted cash | 99,306 |  | 135,631 |
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 | 120,913 |  | 119,525 |
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 | 61,885 |  | 72,054 |
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 | 37,421 |  | 63,577 |
Fair Value, Recurring | Restricted Assets | Significant other observable inputs (level 2) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 0 |  | 0 |
Fair Value, Recurring | Restricted Assets | Significant unobservable inputs (level 3) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 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 | 31,804 |  | 42,431 |
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 | 74,912 |  | 76,097 |
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 | 13,235 |  | 48 |
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 | 962 |  | 949 |
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 |

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