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Debt Obligations, net - Debt Covenants (Details)	Sep. 30, 2019 USD ($)	Sep. 30, 2017 USD ($)
Unsecured Debt
Debt Instrument [Line Items]
Unencumbered assets to unsecured indebtedness ratio (at least)	1.2
Consolidated fixed charge coverage ratio	1.5
Secured Debt | 2015 $350 million Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000.0	$ 325,000,000.0
Borrowing base asset value ratio	1.5
Cash flow to fixed charges ratio	1.5
Secured Debt | 2016 Senior Term Loan
Debt Instrument [Line Items]
Collateral coverage ratio (at least)	1.25

X

- Definition

Debt Instrument Covenant Borrowing Base Asset Value Ratio

+ References

No definition available.

+ Details

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X

- Definition

Debt Instrument, Covenant, Cash Flow To Fixed Charges Ratio

+ References

No definition available.

+ Details

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X

- Definition

Represents the multiple of the minimum collateral coverage on outstanding borrowings required under the terms of the debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Debt Instrument, Covenant, Multiple of Minimum Fixed Charges on Outstanding Borrowings

+ References

No definition available.

+ Details

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X

- Definition

Represents the minimum ratio of encumbered assets to unsecured indebtedness required under the terms of the debt covenant.

+ References

No definition available.

+ Details

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X

- 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.

+ References

No definition available.

+ Details

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X

- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Details

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- Details

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- Details

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