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Acquisitions (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 31, 2018
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