Debt Obligations - Senior Credit Agreement (Details)	3 Months Ended	12 Months Ended
Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
2016 Credit Facilities
Debt Instrument [Line Items]
Principal amount of line of credit	$ 1,325,000,000
2016 Credit Facilities \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rates		1.50%
2016 Credit Facilities \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rates		2.50%
2016 Credit Facilities \| Base Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rates		0.50%
2016 Credit Facilities \| Base Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rates		1.50%
Line of Credit \| 2016 Credit Facilities
Debt Instrument [Line Items]
Maximum consolidated interest coverage ratio	4.5
Minimum consolidated interest coverage ratio	3.0
Secured Debt \| Term Loans
Debt Instrument [Line Items]
Principal amount of line of credit	$ 875,000,000
Secured Debt \| Line of Credit \| Term Loans
Debt Instrument [Line Items]
Term of debt	5 years
Outstanding principal balance	$ 281,000,000	$ 285,000,000
Due in fiscal 2018	4,000,000
Due in fiscal 2019	8,000,000
Due in fiscal 2020	8,000,000
Due in fiscal 2021	15,000,000
Revolver
Debt Instrument [Line Items]
Principal amount of line of credit	450,000,000
Total borrowing capacity remaining	$ 439,000,000
Revolver \| Line of Credit
Debt Instrument [Line Items]
Term of debt	5 years
Outstanding principal balance	$ 0	$ 0
Letter of Credit
Debt Instrument [Line Items]
Principal amount of line of credit	100,000,000
Letters of credit outstanding	$ 11,000,000

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

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
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- Definition

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.

+ References

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.

+ References

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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 fourth 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 50
-Paragraph 1
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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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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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 remainder of the 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

Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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Debt Instrument, Covenant, Leverage Ratio, Maximum

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