Annual report pursuant to Section 13 and 15(d)

Description of Business, Basis of Presentation, and Significant Accounting Policies (Estimated Useful Lives of Depreciable Assets) (Details)

v3.10.0.1
Description of Business, Basis of Presentation, and Significant Accounting Policies (Estimated Useful Lives of Depreciable Assets) (Details)
 12 Months Ended
May 31, 2018
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