Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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No definition available.

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Debt Instrument, Covenant, Leverage Ratio, Maximum

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Line of Credit Facility, Maximum Borrowing Capacity, Sublimit

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Debt - Senior Credit Agreement (Details)		6 Months Ended	9 Months Ended	12 Months Ended
Debt - Senior Credit Agreement (Details)	Apr. 12, 2019 USD ($)	Apr. 11, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2016 USD ($)
2016 Credit Facilities
Debt Instrument [Line Items]
Original principal amount of debt				$ 1,325,000,000
2019 Credit Facilities
Debt Instrument [Line Items]
Original principal amount of debt	$ 1,050,000,000
2019 Credit Facilities \| Line of Credit
Debt Instrument [Line Items]
Maximum consolidated net leverage ratio			4.5
Minimum consolidated interest coverage ratio			3.0
2019 Revolver
Debt Instrument [Line Items]
Letters of credit outstanding			$ 9,000,000
Secured Debt \| 2016 Term Loans \| Line of Credit
Debt Instrument [Line Items]
Original principal amount of debt				$ 875,000,000
Term of debt				5 years
Repayments of long-term debt	255,000,000	$ 15,000,000
Secured Debt \| 2019 Term Loans \| Line of Credit
Debt Instrument [Line Items]
Original principal amount of debt	$ 575,000,000
Term of debt	5 years
Quarterly installments due beginning in 2020			7,000,000
Quarterly installments due beginning in 2021			14,000,000
Secured Debt \| Trade Receivables Facility \| Line of Credit
Debt Instrument [Line Items]
Original principal amount of debt			175,000,000
Repayments of long-term debt	$ 120,000,000
Revolvers \| 2016 Revolver \| Line of Credit
Debt Instrument [Line Items]
Original principal amount of debt				$ 450,000,000
Term of debt				5 years
Line of credit, sublimit				$ 100,000,000
Borrowings from revolving credit facility			39,000,000
Repayments of long-term debt	186,000,000
Revolvers \| 2019 Revolver \| Line of Credit
Debt Instrument [Line Items]
Original principal amount of debt	$ 475,000,000
Term of debt	5 years
Line of credit, sublimit	$ 100,000,000
Total borrowing capacity remaining			$ 466,000,000
LIBOR \| Minimum \| 2019 Credit Facilities
Debt Instrument [Line Items]
Spread on variable rates			1.375%
LIBOR \| Maximum \| 2019 Credit Facilities
Debt Instrument [Line Items]
Spread on variable rates			2.00%
Base Rate \| Minimum \| 2019 Credit Facilities
Debt Instrument [Line Items]
Spread on variable rates			0.375%
Base Rate \| Maximum \| 2019 Credit Facilities
Debt Instrument [Line Items]
Spread on variable rates			1.00%