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FAIR VALUE MEASUREMENT (Tables) | 6 Months Ended
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Jun. 25, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Our assets measured at fair value on a recurring basis consisted of the following:
| June 25, 2023
(in thousands) | Total fair value | Quoted prices in active markets for identical assets (level 1) | Significant other observable inputs (level 2) | Significant unobservable inputs (level 3)
Cash and cash equivalents | $ | 49,653 |  | $ | 49,653 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 58,099 |  | 58,099 |  | — |  | — |
Cash, cash equivalents and restricted cash (1) | $ | 107,752 |  | $ | 107,752 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 35,989 |  | $ | — |  | $ | 35,989 |  | $ | — |
Corporate debt securities | 71,897 |  | — |  | 71,897 |  | — |
Agency mortgage-backed securities | 4,570 |  | — |  | 4,570 |  | — |
U.S. government and agency securities | 943 |  | — |  | 943 |  | — |
Restricted investments classified as held-to-maturity (2) | $ | 113,399 |  | $ | — |  | $ | 113,399 |  | $ | — |
| December 25, 2022
(in thousands) | Total fair value | Quoted prices in active markets for identical assets (level 1) | Significant other observable inputs (level 2) | Significant unobservable inputs (level 3)
Cash and cash equivalents | $ | 72,054 |  | $ | 72,054 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 63,577 |  | 63,577 |  | — |  | — |
Cash, cash equivalents and restricted cash (1) | $ | 135,631 |  | $ | 135,631 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 42,431 |  | $ | — |  | $ | 42,431 |  | $ | — |
Corporate debt securities | 76,097 |  | — |  | 76,097 |  | — |
Agency mortgage-backed securities | 48 |  | — |  | 48 |  | — |
U.S. government and agency securities | 949 |  | — |  | 949 |  | — |
Restricted investments classified as held-to-maturity (2) | $ | 119,525 |  | $ | — |  | $ | 119,525 |  | $ | — |
(1)Cash, cash equivalents and restricted cash include money market funds and deposits. (2)Refer to Note 3: Restricted Cash and Investments for additional details on our held-to-maturity debt securities.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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