PROPERTY, PLANT AND EQUIPMENT (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment held for sale	$ 75,506
Continuing Operations [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense for the property, plant and equipment	82,852	75,283	72,109
Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense for the property, plant and equipment	$ 7,536	$ 9,178	$ 9,752