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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Income Tax Disclosure [Abstract]            
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations         $ 0.8  
Corporate income tax rate (as a percent) 21.00% 35.00%        
Income tax expense (benefit) as a percent of income before income taxes     8.30% 4.10% 7.30% 1.90%
Tax benefit recorded related to the recognition of excess tax benefits from share-based compensation     $ 0.2   $ 0.5 $ 2.6
Unrecognized tax benefit from favorable resolution of uncertain tax position       $ 2.2   $ 2.8