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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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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