CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (66,727)	$ 36,715
Other comprehensive income (loss):
Foreign currency translation adjustment	(1,331)	(1,174)
Net unrealized holding gain (loss) securities, net of tax	(85)	14
Pension liability adjustments, net of tax	(284)	(419)
Other comprehensive loss	(1,700)	(1,579)
Comprehensive income (loss)	$ (68,427)	$ 35,136