CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (27,629)	$ (6,159)	$ (33,376)	$ (4,924)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(112)	(3,064)	5,281	(2,387)
Net unrealized holding loss on securities, net of tax	0	0	0	(96)
Pension liability adjustments, net of tax	0	(129)	0	(131)
Other comprehensive (loss) income	(112)	(3,193)	5,281	(2,614)
Comprehensive loss	$ (27,741)	$ (9,352)	$ (28,095)	$ (7,538)