Fair Value Measurements Fair Value Measurements Not Practicable (Details) - USD ($)	Dec. 27, 2015	Sep. 27, 2015
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair Value, Estimate Not Practicable, Investments	$ 6,359,000
Debt, Long-term and Short-term, Combined Amount	$ 703,996,000	$ 725,872,000

This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

Name:	us-gaap_FairValueEstimateNotPracticableInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant