Carrying amount of convertible debt equity component, before issuance costs

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Threshold period of specified consecutive trading days within which trading price of the notes must be less than 98% of the product of the last reported sale price of our common stock and the conversion rate on such date.

+ References

No definition available.

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The percentage by which the conversion price exceeds the last reported trading price of the common stock on the date of issuance of the convertible debt instrument.

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No definition available.

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- Definition

Convertible debt, threshold percentage, product of common stock price and conversion price

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Threshold number of common shares that may be issued upon conversion of the notes above which requires shareholder approval.

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No definition available.

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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 eligibility for redemption, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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

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No definition available.

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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 redemption.

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No definition available.

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- Definition

Fair value of convertible debt conversion feature

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No definition available.

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- Definition

Fair value of similar notes without conversion feature

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Number of business days after the specified trading price criteria met that notes may be converted.

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No definition available.

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- Definition

Number of shares that would require cash settlement

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No definition available.

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Percentage of maximum number of shares that would require cash settlement

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No definition available.

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- Definition

Percentage of the maximum number of shares authorized for issuance

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No definition available.

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- Definition

Percentage of common shares outstanding that could be exceeded if the convertible notes are converted into common shares.

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No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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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

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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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.

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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

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

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

+ References

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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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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

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.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Convertible Debt (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended
	Jul. 31, 2017 USD ($)	Jul. 25, 2017 $ / shares	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) shares days $ / shares	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Percentage of the maximum number of shares authorized for issuance			40.00%	40.00%
Percentage of maximum number of shares that would require cash settlement			60.00%	60.00%
Debt instrument, convertible, threshold percentage of stock price trigger for redemption				130.00%
Debt instrument, convertible, threshold trading days for redemption \| days				20
Debt Instrument, Convertible, Threshold Consecutive Trading Days for redemption				30 days
Net proceeds received from convertible debt offering				$ 222,311	$ 0
Remaining amortization period of convertible debt				70 months
Fair value of similar notes without conversion feature	$ 194,200
Fair value of convertible debt conversion feature	35,800
Embedded derivative liability	21,400
Carrying amount of convertible debt equity component, before issuance costs	14,400
Convertible debt
Debt Instrument [Line Items]
Principal amount, long-term debt issued	$ 230,000
Interest rate on convertible debt	5.00%		5.00%	5.00%
Initial conversion rate, convertible debt				46.0829
Initial conversion price, convertible debt \| $ / shares			$ 21.70	$ 21.70
Conversion premium		40.00%
Share Price \| $ / shares		$ 15.50
Debt Instrument, Convertible, Threshold Trading Days \| days				20
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| days				30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger				130.00%
Number of business days after the specified trading price criteria met that notes may be converted \| days				5
Consecutive trading days, trading price criteria				5 days
Convertible debt, threshold percentage, product of common stock price and conversion price				98.00%
Shares outstanding, percentage threshold				19.99%
Convertible debt, threshold shares, approval of shareholders \| shares				5,964,858
Number of shares into which debt is initially convertible \| shares				10,599,067
Debt Instrument, Redemption Price, Percentage				100.00%
Net proceeds received from convertible debt offering	$ 222,300
Total issuance costs incurred			$ 7,700
Issuance costs allocated to debt component			7,200	$ 7,200
Issuance costs allocated to equity component			500
Debt term				72 months
Embedded derivative liability			$ 15,120	$ 15,120
Term Loan Facility
Debt Instrument [Line Items]
Repayment of term loan	160,000
Debt term				5 years
Revolving Credit Facility
Debt Instrument [Line Items]
Repayment of revolving borrowings	$ 62,300
Debt term				5 years
Maximum \| Convertible debt
Debt Instrument [Line Items]
Number of shares into which debt is initially convertible \| shares				14,838,703
Number of shares that would require cash settlement \| shares				8,873,845