COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income Items (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 47,894	$ 57,137	$ 48,818	$ 52,692
Foreign currency translation adjustment	2,420	664	5,393	677
Net unrealized holding loss on securities, net of tax	0	(96)	0	(96)
Pension liability adjustments, net of tax	0	0	0	(2)
Other comprehensive income	2,420	568	5,393	579
Ending balance	47,747	53,815	47,747	53,815
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,816	1,045	3,843	1,034
Foreign currency translation adjustment			5,393	677
Net unrealized holding loss on securities, net of tax				(96)
Pension liability adjustments, net of tax				(2)
Other comprehensive income	2,420	568	5,393	579
Ending balance	9,236	1,613	9,236	1,613
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			5,025	5,017
Foreign currency translation adjustment			5,393	677
Net unrealized holding loss on securities, net of tax				0
Pension liability adjustments, net of tax				0
Other comprehensive income			5,393	677
Ending balance	10,418	5,694	10,418	5,694
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				(2)
Other comprehensive income			0	(2)
Ending balance	$ (1,182)	(4,081)	$ (1,182)	(4,081)
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 income				(96)
Ending balance		$ 0		$ 0