Summary of Significant Accounting Policies and Practices - Estimated Useful Lives of Assets (Detail)	6 Months Ended
	Nov. 30, 2015
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	20 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	40 years
Leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	15 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	12 years
Furniture and fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Furniture and fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	10 years
Computers and computer software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Computers and computer software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	5 years
Automobiles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Automobiles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	5 years