Difference between the redemption price and the principal amount of the debt

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Maximum percentage of trading price per $1000 notes to the product of last reported sale price of common stock and conversion rate of notes, to determine eligibility of conversion

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Discount rate used to determine the fair value of the liability component of a convertible debt

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Repurchase price of Senior Secured Notes as percentage of principal amount in case of change in control.

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Unpaid interest deposited to escrow on redemption of debt

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Number of days the warrants mature over commencing on the maturity date

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate within one year of the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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Date the warrants or rights are exercisable, in CCYY-MM-DD format.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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

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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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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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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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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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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 conversion feature.

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No definition available.

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

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Increase for accrued, but unpaid interest on the debt instrument for the period.

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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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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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

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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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No definition available.

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No definition available.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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The number of issuer's shares to which the option contract is indexed.

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Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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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 inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Borrowings (Narrative) (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended			6 Months Ended
	Jan. 31, 2015 USD ($) shares $ / shares	Apr. 30, 2016 USD ($) $ / shares shares	May. 02, 2015 USD ($) $ / shares	Jan. 31, 2015 USD ($)	Apr. 30, 2016 USD ($) shares $ / shares	May. 02, 2015 USD ($) $ / shares	Oct. 31, 2015 USD ($)	Jan. 14, 2015 USD ($) $ / shares shares	Jan. 22, 2013 USD ($)	Jan. 20, 2010 USD ($)
Debt Instrument
Proceeds from convertible notes					$ 0	$ 565,656,000
Cash dividends declared per share \| $ / shares		$ 0.045	$ 0.035		$ 0.090	$ 0.070
Purchase of convertible hedge					$ 0	$ 86,135,000
Proceeds from issuance of warrants					$ 0	51,175,000
Senior Secured 2020 Notes
Debt Instrument
Debt Instrument, Face Amount										$ 300,000,000
Debt Instrument, Redemption Price, Percentage					103.438%
Irrevocable deposit								$ 322,200,000
Repayment of principal amount								300,000,000
Call premium								10,300,000
Debt Instrument, Increase, Accrued Interest				$ 10,300,000
Unpaid interest deposited to escrow								1,600,000
Call premium cost and original issue discount and debt issuance costs related to lenders that did not participate in refinancing				$ 20,400,000
Convertible Senior Unsecured 2020 Notes
Debt Instrument
Debt Instrument, Face Amount								$ 575,000,000
Proceeds from convertible notes	$ 565,700,000
DiscountRateForFairValueOfLiabilityComponent	4.57%
Debt Instrument, Convertible, Remaining Discount Amortization Period					3 years 8 months
Long-Term Debt, Fair Value		$ 560,600,000			$ 560,600,000		$ 568,000,000
Maturity	Jan. 01, 2020				Jan. 01, 2020
Debt Instrument, Convertible, Conversion Ratio	62.7746				63.0192
Debt Instrument, Convertible, Number of Equity Instruments \| shares	36.1				36.2
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 15.87			$ 15.87			$ 15.93
Debt Instrument, Convertible, If-converted Value in Excess of Principal					$ 0
Repurchase price of notes in case of change in control, percentage of face value	100.00%
Shares Covered By Note Hedge \| shares								36.1
Note Hedge, Exercise Price \| $ / shares	$ 15.93				$ 15.87
Purchase of convertible hedge	$ 86,100,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights \| shares		36.2			36.2			36.1
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 20.57			$ 20.57			$ 20.65
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Apr. 01, 2020
WarrantsMaturityPeriod	60 days
Proceeds from issuance of warrants	$ 51,200,000
Interest Expense, Debt [Abstract]
Amortization of Debt Discount		$ 4,200,000	$ 4,000,000		$ 8,400,000	4,700,000
Interest Expense, Debt, Excluding Amortization		2,000,000	$ 2,000,000		4,000,000	$ 2,300,000
Senior Unsecured 2023 Notes
Debt Instrument
Debt Instrument, Face Amount									$ 300,000,000
Long-Term Debt, Fair Value		$ 291,700,000			$ 291,700,000		$ 293,900,000
Maturity					Jan. 15, 2023
Repurchase price of notes in case of change in control, percentage of face value					101.00%
Debt Instrument, Redemption Price, Percentage					100.00%
Trading Price Trigger One \| Convertible Senior Unsecured 2020 Notes
Debt Instrument
Debt Instrument, Convertible, Threshold Trading Days	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days	30 days
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Trading Price Trigger Two \| Convertible Senior Unsecured 2020 Notes
Debt Instrument
Debt Instrument, Convertible, Threshold Trading Days	5
Debt Instrument, Convertible, Threshold Consecutive Trading Days	10 days
Debt Instrument, Convertible, Threshold Percentage of Notes Price Trigger	98.00%