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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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

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.

+ References

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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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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Organization - Additional Information 1 (Detail) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Jun. 18, 2014	Jun. 30, 2015	Jun. 30, 2014	Jan. 30, 2016	Jan. 31, 2015	Jul. 31, 2015
Debt Instrument [Line Items]
Payment for convertible hedge transactions				$ 68,250	$ 73,325
Aggregate proceeds from sale of warrants				30,390	40,390
Offering costs				2,382	5,385
Convertible Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				300,000
Payment for convertible hedge transactions		$ 68,300
Aggregate proceeds from sale of warrants		30,400
Cash proceeds from convertible debt issuance and convertible hedge transactions, net of initial purchasers discounts and commissions and offering costs		256,000
Offering costs		6,100
Convertible Senior Notes Due 2020 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member]
Debt Instrument [Line Items]
Payment for convertible hedge transactions		68,300
Convertible Senior Notes Due 2020 [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 250,000
Debt instrument, interest rate		0.00%
Convertible Senior Notes Due 2020 [Member] \| Exercise of Over Allotment Option in Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount						$ 50,000
Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 350,000	$ 350,000
Aggregate proceeds from sale of warrants	$ 40,400
Cash proceeds from convertible debt issuance and convertible hedge transactions, net of initial purchasers discounts and commissions and offering costs			$ 311,700
Offering costs			5,400
Convertible Senior Notes Due 2019 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member]
Debt Instrument [Line Items]
Payment for convertible hedge transactions	73,300		73,300
Aggregate proceeds from sale of warrants			40,400
Convertible Senior Notes Due 2019 [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 350,000		$ 350,000
Debt instrument, interest rate	0.00%		0.00%