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Acquisitions (Details)
$ in Thousands
12 Months Ended
Jul. 31, 2016
USD ($)
business
Jul. 31, 2015
USD ($)
business
Jul. 31, 2014
USD ($)
Business Acquisition [Line Items]      
Number of Businesses Acquired | business 0 0  
Total cash paid, net of cash acquired $ 0 $ 0 $ 14,300
2014 Acquisitions      
Business Acquisition [Line Items]      
Total acquisition price     14,500
Allocation of the acquisition:      
Accounts receivable and prepaid expenses     734
Property and equipment     71
Inventory     81
Intangible assets     6,071
Goodwill     7,682
Liabilities assumed     (171)
Fair value of net assets and liabilities acquired     $ 14,468