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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended 14 Months Ended
Feb. 28, 2019
Nov. 30, 2017
Dec. 21, 2017
Feb. 28, 2019
May 31, 2019
May 31, 2018
Feb. 28, 2019
Income Taxes              
Tax benefit, recognition of previously unrecognized uncertain tax positions $ 4.7     $ 4.7      
Tax benefit, tax provision to federal income tax return filing differences 1.8 $ 1.8   $ 1.8      
Federal statutory income tax rate (as a percent)     35.00%       21.00%
Effective income tax rate (as a percent)         21.00% 29.20%  
Tax benefits, impact of tax reform act 14.8            
Tax benefits, impact of re-measurement of deferred tax assets and liabilities $ 13.0