Description of Business, Basis of Presentation, and Significant Accounting Policies (Estimated Useful Lives of Depreciable Assets) (Details)	12 Months Ended
	May 31, 2016
Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Minimum [Member] | Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	35 years
Maximum [Member] | Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years