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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 24, 2016 | Sep. 26, 2015
--- | --- | ---
Assets: |  |
Assets measured at fair value on a recurring basis | $ 2.6 | $ 27.7
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 38.3 | 29.4
Equity Securities [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 1.0 | 15.2
Mutual Funds [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis |  | 5.6
Interest Rate Cap [Member] |  |
Assets: |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 1.4 | 6.9
Deferred Compensation Liabilities [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 37.0 | 29.4
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 1.0 | 20.8
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 37.0 | 29.4
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Equity Securities [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 1.0 | 15.2
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Mutual Funds [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis |  | 5.6
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Interest Rate Cap [Member] |  |
Assets: |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 0.0 | 0.0
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Deferred Compensation Liabilities [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 37.0 | 29.4
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 1.6 | 6.9
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 1.3 | 0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis |  | 0.0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member] |  |
Assets: |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 1.4 | 6.9
Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Liabilities [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] |  |
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
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] |  |
Assets: |  |
Assets measured at fair value on a recurring basis |  | 0.0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Cap [Member] |  |
Assets: |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Deferred Compensation Liabilities [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 0.0 | $ 0.0
Assets [Member] | Foreign Exchange Forward [Member] |  |
Assets: |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.2 |
Assets [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Foreign Exchange Forward [Member] |  |
Assets: |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.0 |
Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] |  |
Assets: |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.2 |
Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] |  |
Assets: |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.0 |
Liability [Member] | Foreign Exchange Forward [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 1.3 |
Liability [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Foreign Exchange Forward [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 0.0 |
Liability [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | 1.3 |
Liability [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis | $ 0.0 |

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