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Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Jan. 31, 2019
Property Plant And Equipment [Line Items] |  |  |  |  |
Accumulated depreciation of property and equipment acquired under finance lease | $ 84.4 |  | $ 84.4 |  | $ 54.5
Depreciation expense | 15.8 | $ 11.4 | 41.7 | $ 34.7 |
Servers and related equipment |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Gross amount of property and equipment acquired under finance lease | 201.7 |  | 201.7 |  | 120.0
Depreciation expense | 11.7 | $ 6.6 | 29.8 | $ 19.0 |
Construction in progress |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Gross amount of property and equipment acquired under finance lease | $ 12.4 |  | $ 12.4 |  | $ 8.8

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- Definition Finance lease accumulated deprecation of property and equipment. + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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