Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.10.0.1
Income Taxes (Narrative) (Details) - $ / shares
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Income Tax Contingency [Line Items]        
Effective income tax rate 23.80% 34.80% 24.10% 34.40%
Net diluted earnings per share related to employee stock-based compensation payments   $ 0.01 $ 0.01 $ 0.02
Maximum [Member]        
Income Tax Contingency [Line Items]        
Net diluted earnings per share related to employee stock-based compensation payments $ 0.01