Estimated Useful Lives of Assets (Detail)	6 Months Ended
	Nov. 30, 2012
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	20 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	40 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	10 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	12 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	10 years
Computers and computer software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Computers and computer software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	5 years
Automobiles | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Automobiles | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	5 years