Other Retirement Plans (Details) - USD ($)	12 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 28, 2014
Other Retirement Plans [Line Items]
Pension Contributions	$ 4,604,000	$ 3,577,000	$ 1,435,000
Cost Related to Other Retirement Plans	4,616,000	4,125,000	3,963,000
GCIU- Employer Retirement Fund [Member] | Multiemployer Plans, Pension [Member]
Other Retirement Plans [Line Items]
Pension Contributions	138,000	145,000	265,000
CWA/ITU Negotiated Pension Plan [Member] | Multiemployer Plans, Pension [Member]
Other Retirement Plans [Line Items]
Pension Contributions	108,000	122,000	133,000
District No. 9 Pension Trust [Member] | Multiemployer Plans, Pension [Member]
Other Retirement Plans [Line Items]
Pension Contributions	$ 31,000	$ 34,000	$ 37,000