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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Oct. 31, 2019 | Jan. 31, 2019
Minimum |  |
Commitments And Contingencies [Line Items] |  |
Purchase obligation, term | 3 years |
Maximum |  |
Commitments And Contingencies [Line Items] |  |
Purchase obligation, term | 8 years |
November 2017 Facility | Wells Fargo Bank | Secured Debt | Letters of Credit |  |
Commitments And Contingencies [Line Items] |  |
Letters of credit facility | $ 26.5 | $ 26.5

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- Definition Commitments and contingencies. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of the unrecognized unconditional purchase obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |