PENSION AND OTHER POSTRETIREMENT BENEFITS Assumptions used in calculations (Details)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Pension Benefits
Defined Benefit Plans and Postretirement Health Benefits
Discount rate for net periodic benefit costs	5.25%	5.50%
Discount rate for year-end obligations	3.75%	5.25%
Rate of increase in compensation levels for net periodic benefit costs	4.00%	4.00%
Rate of increase in compensation levels for year-end obligations	3.50%	4.00%
Long-term expected rate of return on assets	7.50%	7.50%
Postretirement Health Benefits
Defined Benefit Plans and Postretirement Health Benefits
Discount rate for net periodic benefit costs	5.25%	5.50%
Discount rate for year-end obligations	3.75%	5.25%
Rate of increase in compensation levels for net periodic benefit costs	0.00%	0.00%
Rate of increase in compensation levels for year-end obligations	0.00%	0.00%
Long-term expected rate of return on assets	0.00%	0.00%