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Investments - Summary of Marketable Securities (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,329,376	$ 1,312,220
Unrealized Gains	970	470
Unrealized Losses	(261)	(683)
Aggregate Fair Value	1,330,085	1,312,007
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	484,846	396,347
Unrealized Gains	214	61
Unrealized Losses	(79)	(178)
Aggregate Fair Value	484,981	396,230
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	188,057	241,914
Unrealized Gains	117	73
Unrealized Losses	(61)	(151)
Aggregate Fair Value	188,113	241,836
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	373,946	419,784
Unrealized Gains	637	336
Unrealized Losses	(121)	(352)
Aggregate Fair Value	374,462	419,768
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	282,527	254,175
Unrealized Gains	2	0
Unrealized Losses	0	(2)
Aggregate Fair Value	282,529	254,173
Included in cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	219,944	216,270
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	219,944	216,270
Included in marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,109,432	1,095,950
Unrealized Gains	970	470
Unrealized Losses	(261)	(683)
Aggregate Fair Value	$ 1,110,141	$ 1,095,737

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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