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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | Jun. 25, 2016 | Sep. 26, 2015
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Cost Method Investments | $ 3.5 | $ 4.2
Borrowed principal | 1,000.0 |
Credit Agreement |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Borrowed principal | 1,430.0 |
Accounts Receivable Securitization [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Borrowed principal | 200.0 |
Senior Notes |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair value of debt instrument | $ 1,040.0 |

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