Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Related party assets [Abstract]
Loans to minority shareholders of E&E Brazil	$ 276	$ 276
Related party liabilities [Abstract]
Notes payable	0	85
Accounts payable	22	56
Total related party liabilities	22	141
Related Party Expenses [Abstract]
Rent expense	234	251	$ 250
Interest expense	2	7	15
Total related party expenses	$ 236	$ 258	$ 265