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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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