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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 7 Months Ended 9 Months Ended
Jun. 28, 2019
Jan. 31, 2020
Jan. 31, 2020
Jan. 31, 2020
Jan. 31, 2019
Business Acquisition [Line Items]          
Pro forma revenues       $ 836.9 $ 784.9
Pro forma pretax losses       $ 655.5 $ 623.9
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     25.7    
Pretax losses recognized     $ 36.3