Other liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Other Liabilities and Financial Instruments Subject to Mandatory Redemption [Abstract]
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation (in Dollars)	$ 271
Capital Lease Interest Rate Range Start	4.30%
Capital Lease Interest Rate Range End	9.50%
Short-term Debt, Weighted Average Interest Rate	8.00%	2.70%