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Debt - Narrative (Details)
3 Months Ended
May 28, 2019
USD ($)
tradingDay
$ / shares
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]    
Interest expense   $ 4,000,000
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024    
Debt Instrument [Line Items]    
Stated interest rate 4.00% 4.00%
Aggregate principal amount of debt $ 207,000,000  
Net proceeds 200,000,000  
Debt issuance costs $ 7,000,000  
Amortization period of interest expense 5 years  
Conversion ratio 0.0448179000  
Debt Instrument, Annual Principal Payment $ 1,000  
Initial conversion price | $ / shares $ 22.3125  
Threshold percentage of stock price trigger 130.00%  
Redemption price 100.00%  
Effective interest rate   10.00%
Equity component of notes   $ 46,000,000
Convertible debt fair value   $ 135,000,000
Minimum    
Debt Instrument [Line Items]    
Trading days | tradingDay 20  
Minimum | Convertible Senior Notes | 4% Convertible Senior Dotes due 2024    
Debt Instrument [Line Items]    
Threshold percentage of stock price trigger 98.00%  
Maximum | Convertible Senior Notes | 4% Convertible Senior Dotes due 2024    
Debt Instrument [Line Items]    
Conversion ratio 0.0571428000