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Debt (Narrative - Senior Notes) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2021
Mar. 31, 2021
Mar. 31, 2020
Feb. 04, 2019
Debt Instrument [Line Items]        
Principal amount of debt outstanding   $ 2,676.9 $ 2,741.9  
5.875% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Coupon rate   5.875%    
Principal amount of debt outstanding   $ 518.7 518.7  
5.875% Senior Notes | Senior Notes | Subsequent Event        
Debt Instrument [Line Items]        
Coupon rate 5.875%      
6.375% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Principal amount of notes       $ 550.0
Coupon rate   6.375%    
Principal amount of debt outstanding   $ 545.6 $ 545.6  
6.375% Senior Notes | Senior Notes | Subsequent Event        
Debt Instrument [Line Items]        
Coupon rate 6.375%      
Senior Credit Facilities And 5.875% Senior Notes And 6.375% Senior Notes        
Debt Instrument [Line Items]        
Net Loss, Amount Free of Restrictions   34.5    
Accumulated Deficit, Amount Free of Restrictions   $ 82.9    
5.500% Senior Notes | Senior Notes | Subsequent Event        
Debt Instrument [Line Items]        
Principal amount of notes $ 1,000.0      
Coupon rate 5.50%      
Debt instrument, redemption, period one | 5.875% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   102.938%    
Debt instrument, redemption, period one | 6.375% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   103.188%    
Debt instrument, redemption, period one | 5.500% Senior Notes | Senior Notes | Subsequent Event        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage 100.00%      
Debt instrument, redemption, period two | 5.875% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   101.439%    
Debt instrument, redemption, period two | 6.375% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   101.594%    
Debt instrument, redemption, period two | 5.500% Senior Notes | Senior Notes | Subsequent Event        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage 102.75%      
Debt instrument, redemption, period three | 5.875% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   100.00%    
Debt instrument, redemption, period three | 6.375% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   100.00%    
Debt instrument, redemption, period three | 6.375% Senior Notes | Senior Notes | Subsequent Event        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage 101.375%      
Change in Control | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   101.00%    
Certain Asset Disposition | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   100.00%