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Debt - Additional Information (Detail) - USD ($)			3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 29, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 16, 2020	Sep. 30, 2019	Apr. 30, 2019	Oct. 09, 2018
Debt Instrument [Line Items]
Interest expense, net			$ 32,000,000	$ 36,000,000	$ 98,000,000	$ 108,000,000
Weighted-average interest rate of total debt	4.00%		4.00%	4.50%	4.00%	4.50%		4.30%
3.625% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Interest rate	3.625%		3.625%	3.625%	3.625%	3.625%
3.625% Senior Secured Notes due 2026 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	3.625%		3.625%		3.625%				3.625%	3.625%
5.500% Senior Notes due 2026 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	5.50%		5.50%		5.50%
5.000% Senior Secured Notes due 2023 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	5.00%		5.00%		5.00%		5.00%
Redemptions of senior notes	$ 244,000,000
Senior Notes
Debt Instrument [Line Items]
Scheduled maturities of long-term debt in 2020	0		$ 0		$ 0
Scheduled maturities of long-term debt in 2021	0		0		0
Scheduled maturities of long-term debt in 2022	0		0		0
Scheduled maturities of long-term debt in 2023	300,000,000		300,000,000		300,000,000
Scheduled maturities of long-term debt, thereafter	$ 1,394,000,000		$ 1,394,000,000		$ 1,394,000,000
Senior Notes | 2.750% Senior Secured Notes due 2028 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	2.75%	2.75%	2.75%		2.75%
Senior Notes | 3.875% Senior Secured Notes due 2030 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	3.875%	3.875%	3.875%		3.875%
Senior Notes | 5.000% Senior Secured Notes due 2023 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	5.00%	5.00%	5.00%		5.00%		5.00%
Redemptions of senior notes	$ 244,000,000	$ 244,000,000			$ 569,000,000

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