Long-Term Debt - Convertible Notes Embedded Derivative (Details) $ / shares in Units, $ in Millions	12 Months Ended
Sep. 30, 2017 day $ / shares	Jun. 30, 2014 USD ($)
2.125% Cash Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Repurchase price, percent of principal amount	100.00%
2.125% Cash Convertible Senior Notes Due 2019 \| Common Class A
Debt Instrument [Line Items]
Conversion rate per $1,000 principal amount (shares)	62.2471
Trading day observation period	80 days
Conversion price, per share (usd per share) \| $ / shares	$ 16.065
Threshold trading days (whether or not consecutive) \| day	20
Threshold consecutive trading days	30 days
Threshold percentage of stock price trigger	130.00%
Measurement period	5 days
Early conversion condition, business day period	5 days
Early conversion condition, percent of product of the last reported sale price of stock	98.00%
Convertible Notes Embedded Derivative \| Long-term debt, less current maturities
Debt Instrument [Line Items]
Fair value, derivative liability \| $		$ 46.5

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

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- Definition

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

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Debt Instrument, Convertible, Early Conversion Condition, Measurement Period

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- Definition

Debt Instrument, Convertible, Observation Period

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- Definition

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

+ References

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-SubTopic 20
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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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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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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.

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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

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

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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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