Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The amount owed to the reporting entity by counterparties in securitized loan transactions.

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Face (par) amount of debt instrument at time of issuance.

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

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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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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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The number of derivative instruments of a particular group held by the entity.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-SubTopic 10
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-Paragraph 1
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The effective interest rate during the reporting period.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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 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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-SubTopic 10
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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 third 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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This is the principal amount outstanding for securitized loans only (across all types of loans).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Financing Agreements (Narrative) (Details)	1 Months Ended	6 Months Ended
Financing Agreements (Narrative) (Details)	May 31, 2017 USD ($)	Mar. 31, 2018 USD ($) derivative	Mar. 31, 2017 USD ($)	May 04, 2018 USD ($)	Sep. 30, 2017 USD ($)	Feb. 28, 2017 USD ($)
Debt Instrument [Line Items]
Payment of long-term debt		$ 54,900,000	$ 36,600,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Number of derivative agreements \| derivative		7
Interest rate swap agreement, notional amount		$ 750,000,000
Interest rate swap, fair value		21,700,000			$ 7,300,000
Securitization Program [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	364 days
Aggregate value of debt	$ 110,000,000
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement		$ 93,200,000			79,100,000
Unsecured debenture interest rate		0.675%
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three		$ 146,300,000
Senior revolving credit facility, maximum borrowing amount		$ 1,462,500,000.0
Debt instrument, maturity date		Sep. 30, 2021
Maximum interest rate during period		0.00%
Payment of long-term debt		$ 54,800,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		109,700,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Senior revolving credit facility, maximum borrowing amount		$ 700,000,000
Debt instrument, maturity date		Sep. 30, 2021
Revolving credit facilities		$ 70,000,000			90,000,000
Current borrowing capacity under the facility		622,000,000
Outstanding letters of credit		$ 8,000,000
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Maximum interest rate during period		3.40%
Senior Unsecured 5.75% Notes due on September 1, 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Sep. 01, 2023
Aggregate value of debt					425,000,000
Unsecured debenture interest rate		5.75%
Senior Unsecured 5.00% Notes due on February 14, 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Feb. 14, 2025
Aggregate value of debt						$ 300,000,000
Unsecured debenture interest rate		5.00%
Maximum [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Securitization Program				$ 0
London Interbank Offered Rate (LIBOR) [Member] \| Securitization Program [Member]
Debt Instrument [Line Items]
Unsecured debenture interest rate		0.675%
Other Assets [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest rate swap, fair value					8,500,000
Other Current Liabilities [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest rate swap, fair value					$ 1,200,000