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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 28, 2019
Oct. 31, 2019
Oct. 31, 2019
Oct. 31, 2019
Oct. 31, 2018
Business Acquisition [Line Items]          
Pro forma revenues       $ 317.7 $ 308.6
Pro forma pretax losses       $ 478.4 $ 453.4
Wave          
Business Acquisition [Line Items]          
Acquisition   $ 1.4 $ 408.4    
Compensation payable $ 8.2        
Expense period 2 years        
Cash performance incentives and share based compensation, vesting period 3 years        
Revenues recognized     14.5    
Pretax losses recognized     $ 21.3