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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. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ 2.6 | $ 8.9 | $ 5.3
Forward foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 0.5 | 8.8 | 5.3
Foreign Exchange Option |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ 2.1 | $ 0.1 | $ 0.0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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