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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 26, 2020 | Sep. 28, 2019
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Assets: |  |
Assets measured at fair value on a recurring basis | $ 11.2 | $ 7.7
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 113.0 | 9.2
Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 0.0 | 0.0
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 11.2 | 7.7
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 31.2 | 0.1
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 0.0 | 0.0
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 81.8 | 9.1
Interest rate caps - derivative |  |
Assets: |  |
Interest rate caps - derivative | 0.0 | 0.1
Interest rate caps - derivative | Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Interest rate caps - derivative |  | 0.0
Interest rate caps - derivative | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Interest rate caps - derivative |  | 0.1
Interest rate caps - derivative | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Interest rate caps - derivative |  | 0.0
Interest rate caps - derivative | Assets |  |
Assets: |  |
Interest rate caps - derivative |  | 0.1
Interest Rate Swap [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 31.2 | 4.7
Interest rate caps - derivative | 31.2 |
Interest Rate Swap [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 0.0 | 0.0
Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 31.2 | 4.7
Interest Rate Swap [Member] | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 0.0 | 0.0
Stock Options |  |
Assets: |  |
Forward foreign currency contracts | 10.1 | 2.0
Stock Options | Assets | Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Forward foreign currency contracts | 0.0 | 0.0
Stock Options | Assets | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Forward foreign currency contracts | 10.1 | 2.0
Stock Options | Assets | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Forward foreign currency contracts | 0.0 | 0.0
Forward foreign currency contracts |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 0.1
Forward foreign currency contracts | Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 0.0
Forward foreign currency contracts | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 0.1
Forward foreign currency contracts | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 0.0
Forward foreign currency contracts | Assets |  |
Assets: |  |
Forward foreign currency contracts | 1.1 | 0.9
Forward foreign currency contracts | Assets | Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Forward foreign currency contracts | 0.0 | 0.0
Forward foreign currency contracts | Assets | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Forward foreign currency contracts | 1.1 | 0.9
Forward foreign currency contracts | Assets | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Forward foreign currency contracts | 0.0 | 0.0
contingent consideration |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 81.8 | 9.1
contingent consideration | Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 0.0 | 0.0
contingent consideration | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 0.0 | 0.0
contingent consideration | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | $ 81.8 | $ 9.1

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