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Acquisitions (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
business
Jul. 31, 2017
USD ($)
Business Acquisition [Line Items]    
Goodwill, purchase accounting adjustments $ (377)  
Number of Businesses Acquired | business 2  
Acquisitions 2018 [Domain]    
Business Acquisition [Line Items]    
Business Acquisition, Percentage of Voting Interests Acquired 100.00% 100.00%
Business Combination, Consideration Transferred $ 8,900  
Goodwill, purchase accounting adjustments 1,300  
Indefinite-lived Intangible Assets Acquired $ 1,200  
Number of Businesses Acquired | business 1  
Acquisitions 2017 [Domain]    
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred   $ 160,700