Debt Instrument, Convertible, Early Conversion Condition, Business Day Period

No definition available.

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- Definition

Debt Instrument, Convertible, Early Conversion Condition, Maximum Percentage of Stock Price Product

+ References

No definition available.

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- Definition

Debt Instrument, Convertible, Early Conversion Condition, Measurement Period

+ References

No definition available.

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- Definition

Debt Instrument, Convertible, Issued and Settled

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Convertible, Observation Period

+ References

No definition available.

+ Details

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- Definition

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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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

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

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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.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Long-Term Debt - Cash Convertible Senior Notes Due 2019 (Details)	1 Months Ended		12 Months Ended
	Jul. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2018 USD ($) day $ / shares	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Debt discount and issuance costs			$ 98,223,000	$ 60,534,000
2019 Convertible Notes
Debt Instrument [Line Items]
Stated interest rate		2.125%	2.125%
Convertible senior notes issued and settled	$ 30,000,000	$ 200,000,000
Interest rate at period end			8.00%
Repurchase price, percent of principal amount			100.00%
Convertible Notes Embedded Derivative \| Long-term debt, less current maturities
Debt Instrument [Line Items]
Fair value, derivative liability		$ 46,500,000
Common Class A \| 2019 Convertible Notes
Debt Instrument [Line Items]
Conversion rate per $1,000 principal amount (shares)			62.2471
Conversion price, per share (usd per share) \| $ / shares			$ 16.065
Trading day observation period			80 days
Threshold trading days (whether or not consecutive) \| day			20
Threshold consecutive trading days \| day			30
Threshold percentage of stock price trigger			130.00%
Early conversion condition, business day period			5 days
Measurement period			5 days
Early conversion condition, percent of product of the last reported sale price of stock			98.00%
Pro Forma \| 2019 Convertible Notes
Debt Instrument [Line Items]
Debt discount and issuance costs			$ 7,600,000