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Accounting Standards - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jul. 31, 2019 | Apr. 30, 2019 | Feb. 01, 2019 | Jan. 31, 2019 | Apr. 30, 2018 | Jan. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets | $ 294,824 |  |  |  |  |
Operating lease liabilities | $ 309,417 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  | $ 279,000 |  |  |
Operating lease liabilities |  |  | 307,000 |  |  |
Deferred rent obligation and lease incentives |  |  | 28,000 |  |  |
Accumulated Deficit | Accounting Standards Update 2018-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | $ 0 | $ 400 | $ (381) | $ 0 | $ 0

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- Definition Present value of lessee's discounted obligation for lease payments from operating 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 (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating 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 Deferred Rent Obligations and Lease Incentives + References No definition available. + Details
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