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Debt - 5.625% Senior Notes due 2026 (Details) - USD ($)
$ in Thousands
1 Months Ended
Dec. 31, 2016
Sep. 30, 2021
Sep. 30, 2020
5.625% Senior Notes due 2026      
Debt Instrument [Line Items]      
Convertible debentures, interest rate 5.625% 5.625%  
Aggregate principal amount $ 500,000 $ 496,764 $ 496,148
Proceeds from debt $ 495,000    
Effective percentage 5.625% 5.625%  
Redemption period after closing 120 days    
5.375% Senior Notes due August 15, 2020      
Debt Instrument [Line Items]      
Convertible debentures, interest rate 5.375%    
Before December 15, 2021 | 5.625% Senior Notes due 2026      
Debt Instrument [Line Items]      
Redemption price percentage 100.00%    
Percentage of principal amount redeemed 35.00%    
After December 15, 2021 | 5.625% Senior Notes due 2026      
Debt Instrument [Line Items]      
Percentage of principal amount redeemed 50.00%    
From Equity Offering | 5.625% Senior Notes due 2026      
Debt Instrument [Line Items]      
Redemption price percentage 105.625%    
Change of control before December 15, 2021 | 5.625% Senior Notes due 2026      
Debt Instrument [Line Items]      
Redemption price percentage 101.00%