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Investments - Summary of Marketable Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,250,422	$ 2,554,514
Unrealized Gains	7	16
Unrealized Losses	(1,839)	(3,423)
Aggregate Fair Value	1,248,590	2,551,107
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	188,241	683,551
Unrealized Gains	1	0
Unrealized Losses	(375)	(1,127)
Aggregate Fair Value	187,867	682,424
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	376,887	797,977
Unrealized Gains	0	0
Unrealized Losses	(437)	(1,142)
Aggregate Fair Value	376,450	796,835
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	402,034	470,259
Unrealized Gains	6	16
Unrealized Losses	(1,027)	(1,154)
Aggregate Fair Value	401,013	469,121
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	283,260	602,727
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	283,260	602,727
Included in cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	239,214	417,613
Unrealized Gains	0	0
Unrealized Losses	0	(1)
Aggregate Fair Value	239,214	417,612
Included in marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,011,208	2,136,901
Unrealized Gains	7	16
Unrealized Losses	(1,839)	(3,422)
Aggregate Fair Value	$ 1,009,376	$ 2,133,495

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