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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Mar. 30, 2019 | Mar. 31, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Investments, fair value | $ 7.7 |  |  | $ 7.7 | $ 10.9 |
Borrowed principal under credit agreement | 1,000.0 |  |  | 1,000.0 |  |
Impairment of intangible assets and equipment | 241.6 | $ 443.8 | $ 46.0 | 106.7 | 46.0 | $ 0.0
Goodwill impairment charge |  |  | $ 685.7 | 0.0 | 685.7 | $ 0.0
Credit Agreement |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Borrowed principal under credit agreement | 1,500.0 |  |  | 1,500.0 |  |
Securitization Program |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Borrowed principal under credit agreement | 234.0 |  |  | 234.0 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Investments, fair value | 0.0 |  |  | 0.0 | $ 0.0 |
2028 Senior Notes |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Fair value of debt instrument | 417.0 |  |  | 417.0 |  |
2025 Senior Notes |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Fair value of debt instrument | 975.5 |  |  | $ 975.5 |  |
Acquired intangible assets [Member] |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Impairment of intangible assets and equipment | 238.6 | 437.0 |  |  |  |
Equipment [Member] |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |
Impairment of intangible assets and equipment | $ 3.0 | $ 6.8 |  |  |  |

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