CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 25,337	$ 6,486	$ 31,187	$ 12,227
Other comprehensive income
Foreign currency translation gain (loss)	5,112	(360)	4,490	(2,671)
Total comprehensive income	$ 30,449	$ 6,126	$ 35,677	$ 9,556