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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 |

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- 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 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph 8 -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition 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 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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