PENSION AND OTHER POSTRETIREMENT BENEFITS Amounts recognized in other comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Pension Benefits
Defined Benefit Plans and Postretirement Health Benefits
Net actuarial loss	$ 6,246	$ 202
Amortization of: Prior service cost	(9)	(14)
Amortization of: Net transition obligation	0	0
Amortization of actuarial loss	(196)	(196)
Total recognized in other comprehensive (income) loss	6,041	(8)
Postretirement Health Benefits
Defined Benefit Plans and Postretirement Health Benefits
Net actuarial loss	263	31
Amortization of: Prior service cost	0	0
Amortization of: Net transition obligation	(10)	(10)
Amortization of actuarial loss	(18)	(8)
Total recognized in other comprehensive (income) loss	$ 235	$ 13