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Fair Value Measurements (Tables) | 3 Months Ended
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Apr. 30, 2018
Fair Value Disclosures [Abstract] |
Information about Assets that are Measured at Fair Value on a Recurring Basis | The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of April 30, 2018 (in thousands):
Description | Level 1 |  | Level 2 |  | Level 3 |  | Total
U.S. agency obligations | $ | — |  |  | $ | 552,878 |  |  | $ | — |  |  | $ | 552,878 |
U.S. treasury securities | 1,389,801 |  |  | — |  |  | — |  |  | 1,389,801 |
Corporate bonds | — |  |  | 418,844 |  |  | — |  |  | 418,844 |
Commercial paper | — |  |  | 760,984 |  |  | — |  |  | 760,984 |
Money market funds | 88,571 |  |  | — |  |  | — |  |  | 88,571 |
Foreign currency derivative assets | — |  |  | 6,484 |  |  | — |  |  | 6,484 |
Total assets | $ | 1,478,372 |  |  | $ | 1,739,190 |  |  | $ | — |  |  | $ | 3,217,562 |
Foreign currency derivative liabilities | $ | — |  |  | $ | 11,070 |  |  | $ | — |  |  | $ | 11,070 |
Total liabilities | $ | — |  |  | $ | 11,070 |  |  | $ | — |  |  | $ | 11,070 |
The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of January 31, 2018 (in thousands):
Description | Level 1 |  | Level 2 |  | Level 3 |  | Total
U.S. agency obligations | $ | — |  |  | $ | 682,424 |  |  | $ | — |  |  | $ | 682,424 |
U.S. treasury securities | 796,835 |  |  | — |  |  | — |  |  | 796,835 |
Corporate bonds | — |  |  | 469,121 |  |  | — |  |  | 469,121 |
Commercial paper | — |  |  | 602,727 |  |  | — |  |  | 602,727 |
Money market funds | 551,804 |  |  | — |  |  | — |  |  | 551,804 |
Foreign currency derivative assets | — |  |  | 98 |  |  | — |  |  | 98 |
Total assets | $ | 1,348,639 |  |  | $ | 1,754,370 |  |  | $ | — |  |  | $ | 3,103,009 |
Foreign currency derivative liabilities | $ | — |  |  | $ | 32,912 |  |  | $ | — |  |  | $ | 32,912 |
Total liabilities | $ | — |  |  | $ | 32,912 |  |  | $ | — |  |  | $ | 32,912 |
Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments | The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the condensed consolidated balance sheets (in thousands):
| April 30, 2018 |  | January 31, 2018
| Net Carrying Amount |  | Estimated Fair Value |  | Net Carrying Amount |  | Estimated Fair Value
0.75% Convertible senior notes | $ | 346,144 |  |  | $ | 520,748 |  |  | $ | 341,509 |  |  | $ | 504,994 |
1.50% Convertible senior notes | 224,107 |  |  | 392,463 |  |  | 221,378 |  |  | 385,550 |
0.25% Convertible senior notes | 939,242 |  |  | 1,247,865 |  |  | 928,467 |  |  | 1,200,577 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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