CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,557)	$ (11,753)	$ 1,235	$ (19,118)
Other comprehensive income (loss):
Foreign currency translation adjustment	664	1,952	677	332
Net unrealized holding loss on securities, net of tax	(96)	(74)	(96)	(89)
Pension liability adjustments, net of tax	0	(469)	(2)	(64)
Other comprehensive income (loss)	568	1,409	579	179
Comprehensive income (loss)	$ (2,989)	$ (10,344)	$ 1,814	$ (18,939)