PENSION AND OTHER POSTRETIREMENT BENEFITS Amounts recognized in other comprehensive income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Defined Benefit Plans and Postretirement Health Benefits
Total recognized in other comprehensive loss (income)	$ (3,540)	$ 4,892	$ 343
Pension Benefits
Defined Benefit Plans and Postretirement Health Benefits
Net actuarial loss (gain)	(2,377)	5,245
Amortization of: Prior service (cost) income	(2)	(5)
Amortization of actuarial loss	(1,133)	(608)
Total recognized in other comprehensive loss (income)	(3,512)	4,632
Postretirement Health Benefits
Defined Benefit Plans and Postretirement Health Benefits
Net actuarial loss (gain)	(7)	256
Amortization of: Prior service (cost) income	4	4
Amortization of actuarial loss	(25)	0
Total recognized in other comprehensive loss (income)	$ (28)	$ 260