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Debt (Details)
12 Months Ended
May 28, 2019
USD ($)
numberOfTradingDays
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Debt Instrument [Line Items]    
Interest expense   $ 10,000,000
Maximum    
Debt Instrument [Line Items]    
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfTradingDays 30  
Minimum    
Debt Instrument [Line Items]    
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfTradingDays 20  
Convertible Notes Payable | 4% Convertible Senior Notes Due 2024    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 207,000,000  
Debt instrument, interest rate 4.00%  
Proceeds from debt, net of issuance costs $ 200,000,000  
Debt issuance costs, gross $ 7,000,000  
Debt issuance cost amortization period 5 years  
Debt instrument, conversion price | $ / shares $ 22.3125 $ 22.3125
Debt instrument, annual principal payment $ 1,000  
Debt instrument, redemption price, percentage 100.00%  
Debt instrument, interest rate   10.00%
Debt instrument, carrying amount of equity component   $ 46,000,000
Convertible debt   $ 205,000,000
Debt Conversion, Converted Instrument, Shares Issued | shares 0.0448179  
Convertible Notes Payable | 4% Convertible Senior Notes Due 2024 | Maximum    
Debt Instrument [Line Items]    
Debt instrument, Percentage of stock price trigger 130.00%  
Debt Conversion, Converted Instrument, Shares Issued | shares 0.0571428  
Convertible Notes Payable | 4% Convertible Senior Notes Due 2024 | Minimum    
Debt Instrument [Line Items]    
Debt instrument, Percentage of stock price trigger 98.00%