CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,284)	$ (66,727)
Other comprehensive income (loss):
Foreign currency translation adjustment	8	(1,331)
Net loss on securities, net of tax	(96)	(85)
Pension liability adjustments, net of tax	2,897	(284)
Other comprehensive income (loss)	2,809	(1,700)
Comprehensive loss	$ (2,475)	$ (68,427)