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FAIR VALUE MEASUREMENT (Tables) | 6 Months Ended
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Jun. 27, 2021
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 27, 2021
(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 | $ | 105,234 |  | $ | 105,234 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 54,436 |  | 54,436 |  | — |  | — |
Cash, cash equivalents and restricted cash (1) | $ | 159,670 |  | $ | 159,670 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 63,926 |  | $ | — |  | $ | 63,926 |  | $ | — |
Corporate debt securities | 75,014 |  | — |  | 75,014 |  | — |
Agency mortgage-backed securities | 267 |  | — |  | 267 |  | — |
U.S. government and agency securities | 1,095 |  | — |  | 1,095 |  | — |
Restricted investments classified as held-to-maturity (2) | $ | 140,302 |  | $ | — |  | $ | 140,302 |  | $ | — |
Deferred compensation investments (3) | $ | 6,303 |  | $ | 6,303 |  | $ | — |  | $ | — |
| December 27, 2020
(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 | $ | 62,507 |  | $ | 62,507 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 56,105 |  | 56,105 |  | — |  | — |
Cash, cash equivalents and restricted cash (1) | $ | 118,612 |  | $ | 118,612 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 70,723 |  | $ | — |  | $ | 70,723 |  | $ | — |
Corporate debt securities | 85,937 |  | — |  | 85,937 |  | — |
Agency mortgage-backed securities | 512 |  | — |  | 512 |  | — |
U.S. government and agency securities | 1,124 |  | — |  | 1,124 |  | — |
Restricted investments classified as held-to-maturity (2) | $ | 158,296 |  | $ | — |  | $ | 158,296 |  | $ | — |
Deferred compensation investments (3) | $ | 5,915 |  | $ | 5,915 |  | $ | — |  | $ | — |
(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. (3)Deferred compensation investments consist of mutual funds and money market funds. Refer to Note 3: Restricted Cash and Investments for additional details on these investments.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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