Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016
Accounting Policies [Abstract]
Available-for-sale Securities, Amortized Cost Basis		$ 21,100
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds		21,500
Available-for-sale Securities, Gross Realized Gains		400
Cumulative Translation Adjustment Summary [Roll Forward]
Cumulative loss on foreign currency translation, Begining balance	$ (109,194)	$ (68,510)	$ (68,510)
(Loss) Gain on foreign currency translation	(5,074)		(40,684)
Cumulative loss on foreign currency translation, Ending balance	$ (114,268)		$ (109,194)