ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income, Net of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 107,628	$ 62,971
Foreign currency translation adjustment	(1,331)	(1,174)
Net unrealized holding loss on securities	(85)	14
Pension liability adjustments	(284)	(419)
Other comprehensive loss	(1,700)	(1,579)
Balance	52,692	107,628
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	2,734	4,313
Foreign currency translation adjustment	(1,331)
Net unrealized holding loss on securities	(85)
Pension liability adjustments	(284)
Other comprehensive loss	(1,700)	(1,579)
Balance	1,034	2,734
Foreign currency items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	6,348
Foreign currency translation adjustment	(1,331)
Net unrealized holding loss on securities	0
Pension liability adjustments	0
Other comprehensive loss	(1,331)
Balance	5,017	6,348
Pension items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(3,795)
Foreign currency translation adjustment	0
Net unrealized holding loss on securities	0
Pension liability adjustments	(284)
Other comprehensive loss	(284)
Balance	(4,079)	(3,795)
Unrealized gains (losses) on securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	181
Foreign currency translation adjustment	0
Net unrealized holding loss on securities	(85)
Pension liability adjustments	0
Other comprehensive loss	(85)
Balance	$ 96	$ 181