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INVESTMENTS IN SECURITIES (Details) - USD ($) | 12 Months Ended
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Dec. 25, 2016 | Dec. 27, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Gross realized gains recognized on available-for-sale securities | $ 900,000 | $ 1,200,000
Gross realized losses recognized on available-for-sale securities | 83,400 | 25,400
Cash equivalents, fixed income securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 44,865,000 | 290,795,000
Fair Value | 44,865,000 | 290,795,000
Cash equivalents, other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 61,000 | 54,831,000
Fair Value | $ 61,000 | $ 54,831,000

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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