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Other Retirement Plans (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2018 | Sep. 24, 2017 | Sep. 25, 2016
Other Retirement Plans [Line Items] |  |  |
Multiemployer Plans, Withdrawal Obligation |  | $ 2,600,000 |
Payment for Pension Benefits | $ 4,990,000 | 0 | $ 4,604,000
Cost Related to Other Retirement Plans | 4,430,000 | 4,396,000 | 4,616,000
GCIU- Employer Retirement Fund [Member] |  |  |
Other Retirement Plans [Line Items] |  |  |
Payment for Pension Benefits | 107,000 | 123,000 | 138,000
CWA/ITU Negotiated Pension Plan [Member] |  |  |
Other Retirement Plans [Line Items] |  |  |
Payment for Pension Benefits | 96,000 | 101,000 | 108,000
District No. 9 Pension Trust [Member] |  |  |
Other Retirement Plans [Line Items] |  |  |
Payment for Pension Benefits | $ 29,000 | $ 31,000 | $ 31,000

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- Definition Cost Related to Other Retirement Plans- amounts recognized as expense during the year related to other retirement plans including defined contribution plans, deferred compensation arrangements, among others. + References No definition available. + Details
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- Definition [Line Items] for Other Retirement Plans [Table] + References No definition available. + Details
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- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Details
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- Details
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- Details
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