COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income Items (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 47,747	$ 53,815	$ 48,818	$ 52,692
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)
Ending balance	19,584	44,151	19,584	44,151
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	9,236	1,613	3,843	1,034
Foreign currency translation adjustment			5,281	(2,387)
Net unrealized holding loss on securities, net of tax				(96)
Pension liability adjustments, net of tax				(131)
Other comprehensive (loss) income	(112)	(3,193)	5,281	(2,614)
Ending balance	9,124	(1,580)	9,124	(1,580)
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			5,025	5,017
Foreign currency translation adjustment			5,281	(2,387)
Net unrealized holding loss on securities, net of tax				0
Pension liability adjustments, net of tax				0
Other comprehensive (loss) income			5,281	(2,387)
Ending balance	10,306	2,630	10,306	2,630
Pension Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,182)	(4,079)
Foreign currency translation adjustment			0	0
Net unrealized holding loss on securities, net of tax				0
Pension liability adjustments, net of tax				(131)
Other comprehensive (loss) income			0	(131)
Ending balance	$ (1,182)	(4,210)	$ (1,182)	(4,210)
Unrealized Gains on Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				96
Foreign currency translation adjustment				0
Net unrealized holding loss on securities, net of tax				(96)
Pension liability adjustments, net of tax				0
Other comprehensive (loss) income				(96)
Ending balance		$ 0		$ 0