Equity (Details) - Warrant [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2017 USD ($) $ / shares shares
Class of Warrant or Right [Line Items]
Warrants Outstanding, Beginning Balance | shares
Warrants, Granted | shares	259,060
Warrants, Exercised | shares	(147,682)
Warrants, Cancelled/Forfeited | shares
Warrants Outstanding, Ending Balance | shares	111,378
Warrants, Excercisable | shares	111,378
Weighted-average Exercise Price, Beginging Balance | $ / shares
Weighted-average Exercise Price, Granted | $ / shares	38.56
Weighted-average Exercise Price, Exercised | $ / shares	34.70
Weighted-average Exercise Price, Cancelled/Forfeited | $ / shares
Weighted-average Exercise Price, Ending Balance | $ / shares	43.68
Weighted-average Exercise Price, Excercisable | $ / shares	$ 43.68
Weighted-average Remaining Contractual Term (in years), Outstanding	1 year 4 months 24 days
Aggregate Intrinsic Value, Beginning Balance | $
Aggregate Intrinsic Value, Ending Balance | $	$ 15,118