ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income, Net of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 52,692	$ 107,628
Foreign currency translation adjustment	8	(1,331)
Net unrealized holding loss on securities	(96)	(85)
Pension liability adjustments	2,897	(284)
Other comprehensive income (loss)	2,809	(1,700)
Balance	48,818	52,692
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	1,034	2,734
Foreign currency translation adjustment	8
Net unrealized holding loss on securities	(96)
Pension liability adjustments	2,897
Other comprehensive income (loss)	2,809	(1,700)
Balance	3,843	1,034
Foreign currency items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	5,017
Foreign currency translation adjustment	8
Net unrealized holding loss on securities	0
Pension liability adjustments	0
Other comprehensive income (loss)	8
Balance	5,025	5,017
Pension items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(4,079)
Foreign currency translation adjustment	0
Net unrealized holding loss on securities	0
Pension liability adjustments	2,897
Other comprehensive income (loss)	2,897
Balance	(1,182)	(4,079)
Unrealized gains (losses) on securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	96
Foreign currency translation adjustment	0
Net unrealized holding loss on securities	(96)
Pension liability adjustments	0
Other comprehensive income (loss)	(96)
Balance	$ 0	$ 96