The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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- Definition

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

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- Definition

The average effective interest rate during the reporting period.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Convertible Senior Notes Due 2024 (Details)	1 Months Ended	3 Months Ended	9 Months Ended
Debt - Convertible Senior Notes Due 2024 (Details)	Jul. 31, 2017 USD ($) $ / shares	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Principal amount		$ 514,732,000	$ 514,732,000
Carrying amount		$ 418,693,000	$ 418,693,000	$ 284,807,000	$ 260,414,000
2024 Convertible Notes
Debt Instrument [Line Items]
Principal amount	$ 143,750,000.00
Stated interest rate	2.875%
Effective interest rate during period		9.00%	9.00%
If-converted value in excess of principal amount			$ 39,600,000
Common Stock Class A Non-voting \| 2024 Convertible Notes
Debt Instrument [Line Items]
Conversion rate per $1,000 principal amount	100
Conversion price, per share (in dollars per share) \| $ / shares	$ 10.00
Additional Paid-in Capital \| 2024 Convertible Notes
Debt Instrument [Line Items]
Carrying amount		$ 25,300,000	$ 25,300,000