COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income Items (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 53,815	$ 94,537	$ 52,692	$ 107,628
Foreign currency translation adjustment	(3,064)	(608)	(2,387)	(276)
Net unrealized holding loss on securities			(96)	(86)
Pension liability adjustments	(129)	0	(131)	(64)
Other comprehensive loss	(3,193)	(605)	(2,614)	(426)
Ending balance	44,151	92,386	44,151	92,386
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			5,017	6,348
Foreign currency translation adjustment			(2,387)	(276)
Net unrealized holding loss on securities			0	0
Pension liability adjustments			0	0
Other comprehensive loss			(2,387)	(276)
Ending balance	2,630	6,072	2,630	6,072
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			(131)	(64)
Other comprehensive loss			(131)	(64)
Ending balance	(4,210)	(3,859)	(4,210)	(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)	(86)
Pension liability adjustments			0	0
Other comprehensive loss			(96)	(86)
Ending balance	0	95	0	95
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,613	2,913	1,034	2,734
Other comprehensive loss	(3,193)	(605)	(2,614)	(426)
Ending balance	$ (1,580)	$ 2,308	$ (1,580)	$ 2,308