CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 4,792	$ (7,365)
Other comprehensive income (loss):
Foreign currency translation adjustment	13	(1,622)
Net unrealized holding loss on securities, net of tax	0	(15)
Pension liability adjustments, net of tax	(2)	405
Other comprehensive income (loss)	11	(1,232)
Comprehensive income (loss)	$ 4,803	$ (8,597)