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Fair Value Measurements - Additional Information (Detail) - USD ($) | Sep. 30, 2017 | Sep. 24, 2016 | Aug. 01, 2012
--- | --- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Investments, fair value | $ 5,300,000 | $ 2,600,000 |
Borrowed principal under credit agreement | 1,000,000,000 |  |
Credit Agreement |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Borrowed principal under credit agreement | 1,670,000,000 |  | $ 2,500,000,000
Securitization Program |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Borrowed principal under credit agreement | 200,000,000 |  |
Senior Notes |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value of debt instrument | 1,050,000,000 | 1,060,000,000 |
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Investments, fair value | $ 0 | $ 0 |

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