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Convertible Senior Notes, Net - Schedule of Senior Notes (Detail) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018	Jun. 30, 2013
Convertible Debt [Abstract]
Net carrying amount, current	$ 570,251,000		$ 341,509,000
Net carrying amount, non-current	939,242,000		1,149,845,000
2018 Notes
Debt Instrument [Line Items]
Contractual interest expense	656,000	$ 656,000
Convertible Debt [Abstract]
Principal	350,000,000		350,000,000	$ 350,000,000
Unamortized debt discount	(3,567,000)		(7,850,000)
Unamortized debt issuance costs	(289,000)		(641,000)
Net carrying amount, current	346,144,000		341,509,000
Carrying amount of the equity component	74,892,000		74,892,000
Equity issuance costs	2,000,000
2020 Notes
Debt Instrument [Line Items]
Contractual interest expense	937,000	$ 938,000
Convertible Debt [Abstract]
Principal	250,000,000		250,000,000	$ 250,000,000
Unamortized debt discount	(24,407,000)		(26,968,000)
Unamortized debt issuance costs	(1,486,000)		(1,654,000)
Net carrying amount, current	224,107,000
Net carrying amount, non-current			221,378,000
Carrying amount of the equity component	66,007,000		66,007,000
Equity issuance costs	2,000,000
2022 Notes
Convertible Debt [Abstract]
Principal	1,150,000,000		1,150,000,000
Unamortized debt discount	(198,127,000)		(208,188,000)
Unamortized debt issuance costs	(12,631,000)		(13,345,000)
Net carrying amount, non-current	939,242,000		928,467,000
Carrying amount of the equity component	$ 219,702,000		$ 219,702,000

X

- Definition

Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ 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 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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
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-Section 50
-Paragraph 4
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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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Amount, after accumulated amortization, of debt discount.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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Debt Instrument, Convertible, After Unamortized Debt Issuance Costs

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