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Fair Value Measurements - Information about Assets that are Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | $ 1,330,085 | $ 1,312,007
Marketable equity investments | 0 | 44,127
Foreign currency derivative assets | 35,238 |
Foreign currency derivative liabilities | 752 |
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable equity investments |  | 44,127
Foreign currency derivative assets | 35,238 | 22,570
Total assets | 1,762,263 | 1,615,775
Foreign currency derivative liabilities | 752 | 3,135
Total liabilities | 752 | 3,135
Fair Value, Measurements, Recurring | U.S. treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 484,981 | 396,230
Fair Value, Measurements, Recurring | U.S. agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 188,113 | 241,836
Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 374,462 | 419,768
Fair Value, Measurements, Recurring | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 282,529 | 254,173
Fair Value, Measurements, Recurring | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 396,940 | 237,071
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable equity investments |  | 44,127
Foreign currency derivative assets | 0 | 0
Total assets | 881,921 | 677,428
Foreign currency derivative liabilities | 0 | 0
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 484,981 | 396,230
Fair Value, Measurements, Recurring | Level 1 | U.S. agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 396,940 | 237,071
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable equity investments |  | 0
Foreign currency derivative assets | 35,238 | 22,570
Total assets | 880,342 | 938,347
Foreign currency derivative liabilities | 752 | 3,135
Total liabilities | 752 | 3,135
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | U.S. agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 188,113 | 241,836
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 374,462 | 419,768
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 282,529 | 254,173
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable equity investments |  | 0
Foreign currency derivative assets | 0 | 0
Total assets | 0 | 0
Foreign currency derivative liabilities | 0 | 0
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities | $ 0 | $ 0

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