Summary of Significant Accounting Policies (Details)	12 Months Ended
	Jul. 31, 2011 Year
Property, Plant and Equipment [Line Items]
Range of Useful Lives, Minimum	3
Range of Useful Lives, Maximum	33
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Range of Useful Lives, Minimum	10
Range of Useful Lives, Maximum	33
Computer systems [Member]
Property, Plant and Equipment [Line Items]
Range of Useful Lives, Average	5
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Range of Useful Lives, Minimum	3
Range of Useful Lives, Maximum	10