PENSION AND OTHER POSTRETIREMENT BENEFITS Change in Benefit Obligation and Plan Assets, Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Pension Benefits
Change in benefit obligation:
Benefit obligation, beginning of year	$ 61,553	$ 54,267
Service cost	1,096	1,626
Interest cost	1,900	2,114
Actuarial loss	8,570	5,125
Benefits paid	(1,663)	(1,579)
Curtailment	(6,632)	0
Settlement	(7,544)	0
Benefit obligation, end of year	57,280	61,553
Change in plan assets:
Fair value of plan assets. beginning of year	40,725	40,971
Actual return on plan assets	5,816	1,333
Employer contribution	8,000	0
Benefits paid	(1,663)	(1,579)
Settlement	(7,544)	0
Fair value of plan assets. end of year	45,334	40,725
Funded status, recorded in Consolidated Balance Sheets	(11,946)	(20,828)
Postretirement Health Benefits
Change in benefit obligation:
Benefit obligation, beginning of year	2,958	2,667
Service cost	116	105
Interest cost	82	97
Actuarial loss	247	97
Benefits paid	(112)	(8)
Curtailment	0	0
Settlement	0	0
Benefit obligation, end of year	3,291	2,958
Change in plan assets:
Fair value of plan assets. beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	112	8
Benefits paid	(112)	(8)
Settlement	0	0
Fair value of plan assets. end of year	0	0
Funded status, recorded in Consolidated Balance Sheets	$ (3,291)	$ (2,958)