COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income Items (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 57,137	$ 105,433	$ 52,692	$ 107,628
Foreign currency translation adjustment	664	1,952	677	332
Net unrealized holding loss on securities			(96)	(89)
Pension liability adjustments	0	(469)	(2)	(64)
Other comprehensive income (loss)	568	1,409	579	179
Ending balance	53,815	94,537	53,815	94,537
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			5,017	6,348
Foreign currency translation adjustment			677	332
Net unrealized holding loss on securities			0	0
Pension liability adjustments			0	0
Other comprehensive income (loss)			677	332
Ending balance	5,694	6,680	5,694	6,680
Pension Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(4,079)	(3,795)
Foreign currency translation adjustment			0	0
Net unrealized holding loss on securities			0	0
Pension liability adjustments			(2)	(64)
Other comprehensive income (loss)			(2)	(64)
Ending balance	(4,081)	(3,859)	(4,081)	(3,859)
Unrealized Gains (Losses) on Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			96	181
Foreign currency translation adjustment			0	0
Net unrealized holding loss on securities			(96)	(89)
Pension liability adjustments			0	0
Other comprehensive income (loss)			(96)	(89)
Ending balance	0	92	0	92
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,045	1,504	1,034	2,734
Other comprehensive income (loss)	568	1,409	579	179
Ending balance	$ 1,613	$ 2,913	$ 1,613	$ 2,913