Retirement Plan (Schedule Of Defined Benefit Pension Plan Asset Allocations) (Details)	Sep. 26, 2015	Sep. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan asset allocation	100.00%	100.00%
Equity Securities And Equity-Like Instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan asset allocation	51.00%	60.00%
Debt Securities And Debit-Like
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan asset allocation	37.00%	28.00%
Other Asset
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan asset allocation	12.00%	12.00%

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant