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Investments - Summary of Marketable Securities (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Jan. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 3,126,447 | $ 2,554,514
Unrealized Gains | 26 | 16
Unrealized Losses | (3,966) | (3,423)
Aggregate Fair Value | 3,122,507 | 2,551,107
U.S. agency obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 553,880 | 683,551
Unrealized Gains | 0 | 0
Unrealized Losses | (1,002) | (1,127)
Aggregate Fair Value | 552,878 | 682,424
U.S. treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,391,222 | 797,977
Unrealized Gains | 7 | 0
Unrealized Losses | (1,428) | (1,142)
Aggregate Fair Value | 1,389,801 | 796,835
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 420,352 | 470,259
Unrealized Gains | 19 | 16
Unrealized Losses | (1,527) | (1,154)
Aggregate Fair Value | 418,844 | 469,121
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 760,993 | 602,727
Unrealized Gains | 0 | 0
Unrealized Losses | (9) | 0
Aggregate Fair Value | 760,984 | 602,727
Included in cash and cash equivalents |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 792,889 | 417,613
Unrealized Gains | 4 | 0
Unrealized Losses | (9) | (1)
Aggregate Fair Value | 792,884 | 417,612
Included in marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,333,558 | 2,136,901
Unrealized Gains | 22 | 16
Unrealized Losses | (3,957) | (3,422)
Aggregate Fair Value | $ 2,329,623 | $ 2,133,495

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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