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Debt - Convertible Senior Notes Due 2025 (Details)
May 14, 2018
USD ($)
day
$ / shares
Sep. 30, 2022
USD ($)
Oct. 01, 2021
USD ($)
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]        
Principal | $   $ 316,250,000 $ 316,250,000  
2025 Convertible Notes | Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 2.375%      
Principal | $ $ 172,500,000 $ 172,500,000    
Interest rate, effective percentage   2.88%    
Conversion rate per $1,000 principal amount (shares) 0.0628931      
Conversion price, per share (usd per share) | $ / shares $ 15.90      
Debt discount and issuance costs | $   $ 2,172,000   $ 31,857,000
2025 Convertible Notes | Senior Notes | Debt Instrument, Redemption, Period One        
Debt Instrument [Line Items]        
Threshold consecutive trading days 30      
Threshold percentage of stock price trigger 130.00%      
Repurchase price, percent of principal amount 100.00%      
2025 Convertible Notes | Senior Notes | Debt Conversion, Condition One        
Debt Instrument [Line Items]        
Threshold trading days (whether or not consecutive) 20      
Threshold consecutive trading days 30      
Threshold percentage of stock price trigger 130.00%      
2025 Convertible Notes | Senior Notes | Debt Conversion, Condition Two        
Debt Instrument [Line Items]        
Threshold consecutive trading days 5      
Threshold percentage of stock price trigger 98.00%      
Business day threshold 5