Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Oct. 03, 2015 USD ($) customers	Sep. 27, 2014 USD ($) customers	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)	Oct. 01, 2011 USD ($)
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 337,600,000	$ 334,154,000
Accumulated depreciation and amortization	(235,155,000)	(226,730,000)
Property and equipment, net	102,445,000	107,424,000
Asset Impairment Charges			$ 0	$ 0	$ 0
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,132,000	6,235,000
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	69,970,000	73,154,000
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	230,208,000	224,133,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31,290,000	$ 30,632,000
Property and equipment, Useful Life, description	Lesser of useful life or terms of leases
Minimum | Building and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5 years
Minimum | Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3 years
Maximum | Building and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40 years
Maximum | Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10 years
Accounts Receivable [Member]
Property, Plant and Equipment [Line Items]
Number of Customers, Represent 10 Percent or more of Accounts Receivable | customers	1	2