PENSION AND OTHER POSTRETIREMENT BENEFITS Change in Benefit Obligation and Plan Assets, Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Pension Benefits
Change in benefit obligation:
Benefit obligation, beginning of year	$ 54,267	$ 53,742
Service cost	1,626	1,723
Interest cost	2,114	2,022
Actuarial loss (gain)	5,125	(1,811)
Benefits paid	(1,579)	(1,409)
Benefit obligation, end of year	61,553	54,267
Change in plan assets:
Fair value of plan assets. beginning of year	40,971	27,457
Actual return on plan assets	1,333	1,719
Employer contribution	0	13,204
Benefits paid	(1,579)	(1,409)
Fair value of plan assets. end of year	40,725	40,971
Funded status, recorded in Consolidated Balance Sheets	(20,828)	(13,296)
Postretirement Health Benefits
Change in benefit obligation:
Benefit obligation, beginning of year	2,667	2,925
Service cost	105	106
Interest cost	97	84
Actuarial loss (gain)	97	(363)
Benefits paid	(8)	(85)
Benefit obligation, end of year	2,958	2,667
Change in plan assets:
Fair value of plan assets. beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	8	85
Benefits paid	(8)	(85)
Fair value of plan assets. end of year	0	0
Funded status, recorded in Consolidated Balance Sheets	$ (2,958)	$ (2,667)