ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Accumulated Other Comprehensive Income (Details) - USD ($)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive (Loss) Income, beginning balance	$ (10,615,000)
Other Comprehensive (Loss) Income	(4,424,000)	$ 1,941,000
Reclassification to retained earnings upon adoption of accounting standard		0
Accumulated Other Comprehensive (Loss) Income, ending balance	(15,039,000)	(10,615,000)
Pension and Postretirement Health Benefits
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive (Loss) Income, beginning balance	(10,384,000)	(10,327,000)
Other comprehensive income (loss), before reclassifications, net of tax	(5,089,000)	1,310,000
Amounts reclassified from accumulated other comprehensive income, net of tax	582,000	897,000
Other Comprehensive (Loss) Income	(4,507,000)	2,207,000
Reclassification to retained earnings upon adoption of accounting standard		(2,264,000)
Accumulated Other Comprehensive (Loss) Income, ending balance	(14,891,000)	(10,384,000)
Tax on Other comprehensive (loss) incomes, Pension and postretirement benefit Plans before reclassifications	(1,607,000)	413,000
Tax on amount reclassified from AOCI, Pension and postretirement health benefits	185,000	373,000
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive (Loss) Income, beginning balance	(231,000)	35,000
Other comprehensive income (loss), before reclassifications, net of tax	83,000	(266,000)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Other Comprehensive (Loss) Income	83,000	(266,000)
Reclassification to retained earnings upon adoption of accounting standard		0
Accumulated Other Comprehensive (Loss) Income, ending balance	(148,000)	(231,000)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive (Loss) Income, beginning balance	(10,615,000)	(10,292,000)
Other comprehensive income (loss), before reclassifications, net of tax	(5,006,000)	1,044,000
Amounts reclassified from accumulated other comprehensive income, net of tax	582,000	897,000
Other Comprehensive (Loss) Income	(4,424,000)	1,941,000
Reclassification to retained earnings upon adoption of accounting standard		(2,264,000)
Accumulated Other Comprehensive (Loss) Income, ending balance	$ (15,039,000)	$ (10,615,000)