PENSION AND OTHER POSTRETIREMENT BENEFITS Amounts recognized in other comprehensive income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Defined Benefit Plans and Postretirement Health Benefits
Total recognized in other comprehensive loss (income)	$ (2,207)	$ (3,540)
Pension Benefits
Defined Benefit Plans and Postretirement Health Benefits
Net actuarial gain	(1,034)	(2,377)
Amortization of: Prior service (cost) income	(2)	(2)
Amortization of actuarial loss (gain)	(901)	(1,133)
Total recognized in other comprehensive loss (income)	(1,937)	(3,512)
Postretirement Health Benefits
Defined Benefit Plans and Postretirement Health Benefits
Net actuarial gain	(276)	(7)
Amortization of: Prior service (cost) income	1	4
Amortization of actuarial loss (gain)	5	(25)
Total recognized in other comprehensive loss (income)	$ (270)	$ (28)