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Long-Term Debt - Korea Credit Facility and Term Loan (Details)
$ / shares in Units, $ in Thousands, ₩ in Billions
1 Months Ended 12 Months Ended
Nov. 04, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
KRW (₩)
tranche
Short-term Debt [Line Items]            
Debt issuance costs incurred     $ 66,301 $ 24,586 $ 13,752  
Proceeds from line of credit     1,064,176 $ 1,056,296 $ 730,772  
Inspire Korea Credit Facility            
Short-term Debt [Line Items]            
Borrowing capacity | ₩           ₩ 1,040.0
Number of tranches | tranche           2
Debt instrument, term   48 months        
Period after first draw for prepayment   1 year        
Commitment fee percentage   0.30%        
Credit enhancement support   $ 100,000        
Debt issuance costs incurred     59,100      
Inspire Korea Credit Facility | Tranche A Loans            
Short-term Debt [Line Items]            
Borrowing capacity | ₩           ₩ 740.0
Interest rate, stated           5.40%
Inspire Korea Credit Facility | Tranche B Loans            
Short-term Debt [Line Items]            
Borrowing capacity | ₩           ₩ 300.0
Interest rate, stated           7.00%
Loan interest reserve period   36 months        
Inspire Korea Credit Facility | Minimum            
Short-term Debt [Line Items]            
Interest rate, stated           5.40%
Inspire Korea Credit Facility | Maximum            
Short-term Debt [Line Items]            
Interest rate, stated           8.10%
Korea Term Loan            
Short-term Debt [Line Items]            
Debt instrument, term 66 months          
Interest rate, stated 17.00%          
Debt issuance costs incurred     9,300      
Proceeds from line of credit $ 275,000          
Fixed charge percentage from share capital and debenture 100.00%          
Debt discounts totaling $ 90,300          
Korea Warrants And Put Option Liability            
Short-term Debt [Line Items]            
Debt issuance costs incurred     $ 4,200      
Number of warrants (in shares) | shares 4,400          
Initial warrant exercise price (in dollars per share) | $ / shares $ 0.01          
Warrants, fully-diluted share capital percentage 22.00%          
Aggregate purchase price $ 110,000          
Korea Warrants And Put Option Liability | Warrants And Put Option | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow            
Short-term Debt [Line Items]            
Warrants, unobservable inputs (as a percent)     0.120      
Korea Warrants And Put Option Liability | Warrants And Put Option | Measurement Input, Price Volatility | Valuation Technique, Discounted Cash Flow            
Short-term Debt [Line Items]            
Warrants, unobservable inputs (as a percent)     0.550      
Korea Warrants And Put Option Liability | Put Option            
Short-term Debt [Line Items]            
Warrants exercisable period 6 years          
Korea Warrants And Put Option Liability | Call Option            
Short-term Debt [Line Items]            
Warrants exercisable period 6 months