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Summary of Significant Accounting Policies - Schedule of Derivative Instruments in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Gain (loss) on derivative | $ (1.2) | $ 11.0 | $ (1.3)
Unrealized gain (loss) on derivative | 3.8 | (2.1) | 6.6
Forward foreign currency contracts |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Gain (loss) on derivative | 0.7 | 11.0 | (1.3)
Unrealized gain (loss) on derivative | (0.2) | (2.2) | 6.6
Foreign Exchange Option |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Gain (loss) on derivative | (1.9) | 0.0 | 0.0
Unrealized gain (loss) on derivative | $ 4.0 | $ 0.1 | $ 0.0

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