Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Fair value of financial and nonfinancial obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Fair value portion of notes payable.

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Derivative aggregate interest rate.

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Fair Value Measurements - Additional Information (Detail) - USD ($)		9 Months Ended	12 Months Ended
	Aug. 01, 2017	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2016	Jun. 01, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers of assets from level 1 to level 2		$ 0		$ 0
Transfers of assets from level 2 to level 1		0		0
Transfers of liabilities from level 1 to level 2		0		0
Transfers of liabilities from level 2 to level 1		0		0
Transfers of assets into level 3		0		0
Transfers of assets out of level 3		0		0
Transfers of liabilities into level 3		0		0
Transfers of liabilities out of level 3		$ 0		0
Contingent consideration in the event of certain operating results are achieved, period		2 years
Total debt fair value debt		$ 3,800,000,000		3,800,000,000
Net carrying value of debt		3,700,000,000		3,800,000,000
Scenario Forecast [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Reclassified from accumulated other comprehensive loss to income			$ 3,000,000
Interest Rate Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount of company's other indebtedness		$ 75,000,000
Senior Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest Rate		5.88%			8.50%
Debt instrument, maturity date		Jun. 15, 2024
Amended and Restated 2016 Term Loan [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest Rate		3.98%
Debt instrument, maturity date		Jun. 27, 2023
Amended and Restated 2016 Term Loan [Member] \| Interest Rate Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap agreements term	4 years
Notional amount of debt hedged	$ 1,100,000,000
Notional amount of debt hedged	$ 825,000,000
Aggregate rate on notional amount	4.47%
Variable rate on notional amount	1.72%
Basis spread on variable rate on notional amount	2.75%
Net carrying value of debt		$ 1,100,000,000
The 2016 Senior Notes [Member] \| Level 2 [Member] \| Senior Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest Rate		5.875%
Debt instrument, maturity date		Jun. 15, 2024
Fair value of Senior Notes		$ 600,000,000		600,000,000
Nonrecurring Fair Value Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis		0		0
Liabilities measured at fair value on a nonrecurring basis		$ 0		$ 0