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Acquisitions (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 USD ($) business | Jul. 31, 2017 USD ($) business
Business Acquisition [Line Items] |  |
Number of Businesses Acquired | business | 0 | 2
Goodwill, Purchase Accounting Adjustments | $ 1,266 |
Indefinite-lived Intangible Assets Acquired | $ 1,200 |
Acquisitions 2017 [Domain] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00%
Total cash paid, net of cash acquired |  | $ 160,700
Acquisitions 2017 [Domain] | Distribution Rights | Minimum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years
Acquisitions 2017 [Domain] | Distribution Rights | Maximum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 11 years
Acquisitions 2017 [Domain] | Customer Relationships | Minimum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years
Acquisitions 2017 [Domain] | Customer Relationships | Maximum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 11 years
Acquisitions 2017 [Domain] | Trade name | Minimum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years
Acquisitions 2017 [Domain] | Trade name | Maximum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 11 years
Acquisitions 2017 [Domain] | Licenses and databases | Minimum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years
Acquisitions 2017 [Domain] | Licenses and databases | Maximum |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 11 years

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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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