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Convertible Senior Notes, Net - Schedule of Senior Notes (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2019 | Jan. 31, 2019 | Sep. 30, 2017 | Jun. 30, 2013
Convertible Debt [Abstract] |  |  |  |  |
Convertible Debt, Current |  | $ 1,233,189,000 | $ 232,514,000 |  |
Convertible Debt, Noncurrent |  | 0 | 972,264,000 |  |
2018 Notes |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |
Principal |  |  |  |  | $ 350,000,000
Equity issuance costs | $ 2,000,000 |  |  |  |
2020 Notes |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |
Principal |  | 249,948,000 | 249,975,000 |  | $ 250,000,000
Unamortized debt discount |  | (10,987,000) | (16,480,000) |  |
Unamortized debt issuance costs |  | (644,000) | (981,000) |  |
Convertible Debt, Current |  | 238,317,000 | 232,514,000 |  |
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 | $ 1,150,000,000 |
Unamortized debt discount |  | (146,070,000) | (167,249,000) |  |
Unamortized debt issuance costs |  | (9,058,000) | (10,487,000) |  |
Convertible Debt, Noncurrent |  | 994,872,000 | 972,264,000 |  |
Carrying amount of the equity component |  | 219,702,000 | $ 219,702,000 |  |
Equity issuance costs |  | $ 4,000,000 |  |  |

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- Definition The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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