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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019
--- | --- | ---
Cash equivalents |  |
Amortized Cost | $ 236,476 | $ 517,811
Available-for-sale securities |  |
Gross Unrealized Gains | 657 | 400
Estimated Fair Value | 700,331 |
Total |  |
Amortized Cost | 796,064 | 851,534
Gross Unrealized Losses | (62) | (142)
Estimated Fair Value | 796,659 | 851,792
Level 2 |  |
Available-for-sale securities |  |
Amortized Cost | 704,734 | 501,471
Gross Unrealized Gains | 657 | 400
Gross Unrealized Losses | (62) | (142)
Estimated Fair Value | 705,329 | 501,729
Commercial paper | Level 2 |  |
Available-for-sale securities |  |
Amortized Cost | 62,695 | 86,655
Gross Unrealized Gains | 31 | 4
Gross Unrealized Losses | (8) | (21)
Estimated Fair Value | 62,718 | 86,638
Corporate notes and bonds | Level 2 |  |
Available-for-sale securities |  |
Amortized Cost | 334,912 | 287,496
Gross Unrealized Gains | 582 | 389
Gross Unrealized Losses | (34) | (105)
Estimated Fair Value | 335,460 | 287,780
U.S. Treasury securities | Level 2 |  |
Available-for-sale securities |  |
Amortized Cost | 232,152 | 4,982
Gross Unrealized Gains | 32 | 0
Gross Unrealized Losses | (15) | (1)
Estimated Fair Value | 232,169 | 4,981
U.S. government agency securities | Level 2 |  |
Available-for-sale securities |  |
Amortized Cost | 69,977 | 36,021
Gross Unrealized Gains | 12 | 7
Gross Unrealized Losses | (5) | (4)
Estimated Fair Value | 69,984 | 36,024
Money market funds | Level 1 |  |
Cash equivalents |  |
Amortized Cost | 91,330 | 350,063
Estimated Fair Value | 91,330 | 350,063
Commercial paper | Level 2 |  |
Cash equivalents |  |
Amortized Cost | 4,998 | 76,828
Gross Unrealized Losses | 0 | (11)
Estimated Fair Value | $ 4,998 | 76,817
Corporate notes and bonds | Level 2 |  |
Cash equivalents |  |
Amortized Cost |  | 2,998
Estimated Fair Value |  | 2,998
U.S. government agency securities | Level 2 |  |
Cash equivalents |  |
Amortized Cost |  | 6,491
Estimated Fair Value |  | $ 6,491

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