PENSION AND OTHER POSTRETIREMENT BENEFITS Components of net periodic benefit cost (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Pension Benefits
Defined Benefit Plans and Postretirement Health Benefits
Service cost	$ 0	$ 1,096,000
Interest cost	1,168,000	1,900,000
Expected return on plan assets	(2,816,000)	(2,790,000)
Amortization of: Prior service costs (income)	0	0
Amortization of: Other actuarial loss	653,000	1,005,000
Settlement cost	631,000	2,012,000
Net periodic benefit cost	(364,000)	3,223,000
Postretirement Health Benefits
Defined Benefit Plans and Postretirement Health Benefits
Service cost	139,000	116,000
Interest cost	51,000	82,000
Expected return on plan assets	0	0
Amortization of: Prior service costs (income)	(6,000)	(6,000)
Amortization of: Other actuarial loss	3,000	0
Settlement cost	0	0
Net periodic benefit cost	$ 187,000	$ 192,000