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Income Taxes and Other Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 29, 2016
Income Tax And Non Income Tax Disclosure [Abstract]    
Annualized effective income tax rate (percentage)   40.10%
Effective income tax rate (percentage) 56.60% 14.20%
Unrecognized tax benefits recognized due to settlement with the Internal Revenue Service   $ 4.5