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Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Investments, fair value		$ 10,900,000	$ 5,300,000
Borrowed principal under credit agreement		1,000,000,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 46,000,000	46,000,000	0	$ 0
Goodwill impairment charge	$ 685,700,000	685,700,000	0	$ 0
Credit Agreement
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Borrowed principal under credit agreement		1,760,000,000
Securitization Program
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Borrowed principal under credit agreement		225,000,000
Significant Unobservable Inputs (Level 3)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Investments, fair value		0	$ 0
2028 Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument		377,000,000
2025 Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument		$ 909,600,000

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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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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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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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