Quarterly report pursuant to Section 13 or 15(d)

Income Taxes Income Taxes (Details)

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Income Taxes Income Taxes (Details)
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Income Tax Disclosure [Abstract]        
Effective income tax rate 36.00% 36.30% 32.90% 36.30%
Effective income tax rate, excluding tax benefit related to prior years     36.00%  
Federal statutory income tax rate     35.00%