Estimated Useful Lives for Major Classes of Depreciable Assets (Detail)	12 Months Ended
	Aug. 31, 2012
Buildings
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	35 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	Shorter of lease term or useful life of the improvement
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	5 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	10 years
Furniture, fixtures and office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	5 years
Computer Hardware and Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	3 years
Computer Hardware and Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	7 years
Transportation Equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life, years	3 years