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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Assets: |  |  |
Assets measured at fair value on a recurring basis | $ 1.7 | $ 11.2 |
Liabilities: |  |  |
Liabilities measured at fair value on a recurring basis | 94.4 | 113.0 |
Fair value adjustments | (6.7) | 0.3 | $ 1.7
Contingent consideration recorded at acquisition | 0.0 | 82.7 | $ 0.0
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 | 1.7 | 11.2 |
Liabilities: |  |  |
Liabilities measured at fair value on a recurring basis | 19.3 | 31.2 |
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 | 75.1 | 81.8 |
Interest Rate Swap [Member] |  |  |
Assets: |  |  |
Assets measured at fair value on a recurring basis | 18.7 | 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 |  |
Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets measured at fair value on a recurring basis | 18.7 |  |
Interest Rate Swap [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Assets measured at fair value on a recurring basis | 0.0 |  |
Stock Options |  |  |
Assets: |  |  |
Forward foreign currency contracts |  | 10.1 |
Stock Options | Assets | Quoted Prices in Active Market for Identical Assets (Level 1) |  |  |
Assets: |  |  |
Forward foreign currency contracts |  | 0.0 |
Stock Options | Assets | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Forward foreign currency contracts |  | 10.1 |
Stock Options | Assets | Significant Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Forward foreign currency contracts |  | 0.0 |
Forward foreign currency contracts | Assets |  |  |
Assets: |  |  |
Forward foreign currency contracts | 1.7 | 1.1 |
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 | 1.7 | 1.1 |
Forward foreign currency contracts | Assets | Significant Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Forward foreign currency contracts | 0.0 | 0.0 |
Forward foreign currency contracts | Liability |  |  |
Liabilities: |  |  |
Liabilities measured at fair value on a recurring basis | 0.6 |  |
Forward foreign currency contracts | Liability | 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 | Liability | Significant Other Observable Inputs (Level 2) |  |  |
Liabilities: |  |  |
Liabilities measured at fair value on a recurring basis | 0.6 |  |
Forward foreign currency contracts | Liability | Significant Unobservable Inputs (Level 3) |  |  |
Liabilities: |  |  |
Liabilities measured at fair value on a recurring basis | 0.0 |  |
contingent consideration |  |  |
Liabilities: |  |  |
Liabilities measured at fair value on a recurring basis | 75.1 |  |
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 | $ 75.1 | $ 81.8 |

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