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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Cash equivalents
Amortized Cost	$ 224,290	$ 517,811
Available-for-sale securities
Gross Unrealized Gains	1,115	400
Estimated Fair Value	706,109
Total
Amortized Cost	800,941	851,534
Gross Unrealized Losses	(160)	(142)
Estimated Fair Value	801,896	851,792
Level 2
Available-for-sale securities
Amortized Cost	705,154	501,471
Gross Unrealized Gains	1,115	400
Gross Unrealized Losses	(160)	(142)
Estimated Fair Value	706,109	501,729
Commercial paper | Level 2
Available-for-sale securities
Amortized Cost	41,197	86,655
Gross Unrealized Gains	45	4
Gross Unrealized Losses	(2)	(21)
Estimated Fair Value	41,240	86,638
Corporate notes and bonds | Level 2
Available-for-sale securities
Amortized Cost	351,691	287,496
Gross Unrealized Gains	835	389
Gross Unrealized Losses	(68)	(105)
Estimated Fair Value	352,458	287,780
U.S. Treasury securities | Level 2
Available-for-sale securities
Amortized Cost	174,897	4,982
Gross Unrealized Gains	172	0
Gross Unrealized Losses	(31)	(1)
Estimated Fair Value	175,038	4,981
U.S. government agency securities | Level 2
Available-for-sale securities
Amortized Cost	137,369	36,021
Gross Unrealized Gains	63	7
Gross Unrealized Losses	(59)	(4)
Estimated Fair Value	137,373	36,024
Money market funds | Level 1
Cash equivalents
Amortized Cost	95,787	350,063
Estimated Fair Value	$ 95,787	350,063
Commercial paper | Level 2
Cash equivalents
Amortized Cost		76,828
Gross Unrealized Losses		(11)
Estimated Fair Value		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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