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.

+ Details

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- Definition

Debt Instrument, Convertible, Early Conversion Condition, Measurement Period

+ References

No definition available.

+ Details

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- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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-Paragraph 1
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-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Conversion Rate
-URI http://asc.fasb.org/extlink&oid=6509012

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+ Details

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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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

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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+ Details

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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.

+ Details

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
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-Paragraph 3
-Subparagraph e
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+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Amount, after accumulated amortization, of debt discount.

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Period Type:	instant

- Definition

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

+ References

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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-Paragraph 3
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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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-Paragraph 2
-Subparagraph (bbb)
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Long-Term Debt - Convertible Senior Notes Due 2024 (Details)	1 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($) day $ / shares	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Principal amount		$ 338,750,000
Additional paid-in capital		348,532,000	$ 318,723,000
Debt discount and issuance costs		$ 60,534,000	34,081,000
2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Principal amount	$ 143,750,000.00
Stated interest rate	2.875%	2.875%
Maturity period		7 years
Convertible debt	$ 102,700,000
Unamortized discount	41,000,000
Deferred financing costs	$ 4,200,000
Interest expense		$ 2,100,000
Remaining unamortized issuance discount period		7 years
Debt discount and issuance costs		$ 42,880,000	$ 0
Common Class A \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Conversion rate per $1,000 principal amount (shares)	100
Conversion price, per share (usd per share) \| $ / shares	$ 10.00
Interest expense \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest expense		1,000,000
Amortization expense \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest expense		1,100,000
Senior Notes \| Holder option \| Common Class A \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Threshold trading days (whether or not consecutive) \| day	20
Threshold consecutive trading days	30 days
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%
Senior Notes \| Company option \| Common Class A \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Threshold trading days (whether or not consecutive) \| day	20
Threshold consecutive trading days	30 days
Threshold percentage of stock price trigger	130.00%
Repurchase price, percent of principal amount	100.00%
Convertible Notes Embedded Derivative
Debt Instrument [Line Items]
Conversion feature accounted for as an equity-classified instrument	$ 39,800,000
Additional paid-in capital		25,300,000
Pro Forma \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Debt discount and issuance costs		$ 42,900,000
Liability Component of Convertible Debt \| 2.875% Convertible Senior Notes, Due 2024
Debt Instrument [Line Items]
Fair value assumptions, discount rate		8.00%