Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Financial assets:
Notes receivable, net	$ 22,024	$ 41,946	$ 0
Investment in unconsolidated affiliate	41,725	37,128	56,843
Financial liabilities:
Fair value impact of a 50 basis point decrease in the calculated credit spread	1,200
Level 1
Financial assets:
Notes receivable, net	0	0
Investment in unconsolidated affiliate	37,306	37,128	49,149
Financial liabilities:
Cash Convertible Notes	0	0	0
Term Loan Facility	0	0
Level 2
Financial assets:
Notes receivable, net	0	0
Investment in unconsolidated affiliate	0	0	0
Financial liabilities:
Cash Convertible Notes	218,500	227,332	190,762
Term Loan Facility	0	0
Level 3
Financial assets:
Notes receivable, net	65,570	83,065
Investment in unconsolidated affiliate	0	0	0
Financial liabilities:
Cash Convertible Notes	0	0	0
Term Loan Facility	48,159	48,688
Carrying Value
Financial assets:
Notes receivable, net	63,277	83,065
Investment in unconsolidated affiliate	41,725	37,128	56,843
Financial liabilities:
Cash Convertible Notes	206,279	197,954	195,221
Term Loan Facility	48,235	47,965
Estimated Fair Value
Financial assets:
Notes receivable, net	65,570	83,065
Investment in unconsolidated affiliate	37,306	37,128	49,149
Financial liabilities:
Cash Convertible Notes	218,500	227,332	$ 190,762
Term Loan Facility	$ 48,159	$ 48,688
Minimum \| Discounted cash flow approach \| Notes Receivable \| Level 3
Financial liabilities:
Discount rate	8.00%
Maximum \| Discounted cash flow approach \| Notes Receivable \| Level 3
Financial liabilities:
Discount rate	15.00%
Term Loan
Financial liabilities:
Fair value impact of a 50 basis point increase in the calculated credit spread	$ 1,200
Term Loan \| Maximum \| Discounted cash flow approach \| Level 3
Financial liabilities:
Discount rate	9.00%

Fair Value of Debt Instrument, Impact of 50 Basis Point Decrease in Calculated Credit Spread

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- Definition

Fair Value of Debt Instrument, Impact of 50 Basis Point Increase in Calculated Credit Spread

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 45
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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4531-111522

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-Name Accounting Standards Codification
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