SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Property, Plant and Equipment (Details)	12 Months Ended
	Jul. 31, 2012 Y
Buildings and leasehold improvements
Property, Plant and Equipment
Useful Life, Minimum (Years)	5
Useful Life, Maximum (Years)	30
Machinery and Equipment - Packaging
Property, Plant and Equipment
Useful Life, Minimum (Years)	2
Useful Life, Maximum (Years)	20
Machinery and Equipment - Processing
Property, Plant and Equipment
Useful Life, Minimum (Years)	2
Useful Life, Maximum (Years)	20
Machinery and Equipment - Mining and Other
Property, Plant and Equipment
Useful Life, Minimum (Years)	3
Useful Life, Maximum (Years)	15
Office furniture, computers and equipment
Property, Plant and Equipment
Useful Life, Minimum (Years)	2
Useful Life, Maximum (Years)	10
Vehicles
Property, Plant and Equipment
Useful Life, Minimum (Years)	3
Useful Life, Maximum (Years)	10