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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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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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