Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Retained Insurance Liabilities [Abstract]
Amount deductible per claim - Insurance Policies	$ 250,000
Amount deductible per claim - Medical Policy	225,000
Total amount reserved for all policies	$ 5,500,000	$ 4,800,000
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Minimum estimated useful life of property, plant and equipment (in years)	5
Maximum estimated useful life of property, plant and equipment (in years)	10
Transportation and Other Equipment
Property, Plant and Equipment [Line Items]
Minimum estimated useful life of property, plant and equipment (in years)	3
Maximum estimated useful life of property, plant and equipment (in years)	7
Office Furniture and Equipment
Property, Plant and Equipment [Line Items]
Minimum estimated useful life of property, plant and equipment (in years)	3
Maximum estimated useful life of property, plant and equipment (in years)	10
Building Improvements
Property, Plant and Equipment [Line Items]
Minimum estimated useful life of property, plant and equipment (in years)	15
Maximum estimated useful life of property, plant and equipment (in years)	40
Software
Property, Plant and Equipment [Line Items]
Minimum estimated useful life of property, plant and equipment (in years)	3
Maximum estimated useful life of property, plant and equipment (in years)	5