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Basis of Presentation and General Information (Carrying Amounts of Major Classes of Assets and Liabilities Presented in Discontinued Operations) (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 27, 2019 | Dec. 28, 2018
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European REL Working Capital group [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Accounts receivable and unbilled revenue, allowance | $ 0 | $ 0

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- Definition Disposal group including discontinued operation allowance for doubtful accounts receivable current. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Details
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Data Type: | na
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