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Summary of Significant Accounting Policies - Gain (Loss) on Fair Value Hedges Recognized in Earnings (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 24, 2016
Forward foreign currency contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ 0.5 | $ 0.4

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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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