Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Commitments and Contingencies Disclosure [Abstract]
Term of agreement				20 years
Total rent expense	$ 15,349	$ 14,278	$ 13,092
Rent expense payable to principal stockholder	$ 3,136	$ 2,125	$ 1,375

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration