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Other Retirement Plans (Details) - USD ($)	12 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 27, 2015
Other Retirement Plans [Line Items]
Multiemployer Plans, Withdrawal Obligation	$ 2,600,000
Payment for Pension Benefits	0	$ 4,604,000	$ 3,577,000
Cost Related to Other Retirement Plans	4,396,000	4,616,000	4,125,000
GCIU- Employer Retirement Fund [Member]
Other Retirement Plans [Line Items]
Payment for Pension Benefits	123,000	138,000	145,000
CWA/ITU Negotiated Pension Plan [Member]
Other Retirement Plans [Line Items]
Payment for Pension Benefits	101,000	108,000	122,000
District No. 9 Pension Trust [Member]
Other Retirement Plans [Line Items]
Payment for Pension Benefits	$ 31,000	$ 31,000	$ 34,000

X

- 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.

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- Definition

[Line Items] for Other Retirement Plans [Table]

+ References

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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.

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X

- 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

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- Details

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