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Long-Term Debt (Tables)
 12 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term debt instruments
September 30, 2022September 30, 2021
(in thousands)Final MaturityFace ValueBook ValueBook Value
Senior Secured Credit Facility2024$— $— $27,000 
Line of Credit202418,000 18,000 20,227 
2021 8% Senior Secured Notes
20261,175,000 1,161,164 1,157,731 
2016 7 7/8% Senior Unsecured Notes2024500,000 495,531 493,599 
Niagara Credit Facility
Revolving
2024— — 27,534 
Swingline2024— — 4,333 
Term Loan202460,945 60,453 68,965 
Niagara Convertible Debenture204029,108 29,108 31,468 
Korea Credit Facility2025362,455 315,475 — 
Korea Term Loan2027311,998 211,425 — 
Expo Credit Facility (1)
2022— — 25,697 
Guaranteed Credit Facility202325,156 24,875 27,208 
Redemption Note Payable202438,880 35,261 53,130 
OtherVaries661 661 1,862 
Long-term debt2,522,203 2,351,953 1,938,754 
Current portion of long-term debt(47,402)(47,402)(80,276)
Long-term debt, net of current portion$2,474,801 $2,304,551 $1,858,478 
Fair value$2,178,852 
Unamortized discounts and debt issuance costs$170,250 $34,022 
_________
(1)     Repaid at maturity on April 1, 2022.
Schedule of Maturities of Long-term Debt
Maturities of long-term debt, excluding unamortized debt issuance costs and discounts, are as follows:
(in thousands) 
Fiscal years:
2023$47,402 
202495,807 
2025500,025 
20261,537,480 
2027312,022 
Thereafter29,467 
Total$2,522,203 
Schedule of Warrants and Put Option
Warrants and Put Option
(in thousands)
Balance, September 30, 2021$— 
Additions90,320 
Unrealized gain(43,020)
Balance, September 30, 2022$47,300