Equity Investments (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Net (losses) gains recognized during the period on equity investments	$ (46)	$ 20
Less: net gains and losses recognized during the period on equity investments sold during the period
Unrealized (losses) gains recognized during the period on equity investments still held at the reporting date	$ (46)	$ 20