COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income Items (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 48,818	$ 52,692
Foreign currency translation adjustment	2,973	13
Pension liability adjustments	0	(2)
Other comprehensive income	2,973	11
Ending balance	47,894	57,137
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,843	1,034
Foreign currency translation adjustment	2,973	13
Pension liability adjustments		(2)
Other comprehensive income	2,973	11
Ending balance	6,816	1,045
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,025	5,017
Foreign currency translation adjustment	2,973	13
Pension liability adjustments		0
Other comprehensive income	2,973	13
Ending balance	7,998	5,030
Pension Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,182)	(4,079)
Foreign currency translation adjustment	0	0
Pension liability adjustments		(2)
Other comprehensive income	0	(2)
Ending balance	$ (1,182)	(4,081)
Unrealized Gains (Losses) on Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		96
Foreign currency translation adjustment		0
Pension liability adjustments		0
Other comprehensive income		0
Ending balance		$ 96