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DEBT - Convertible Senior Notes Narrative (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 27, 2021 USD ($) $ / shares | Nov. 04, 2021 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 13, 2024 USD ($) | Sep. 27, 2021
DEBT |  |  |  |  |  |
Long-term debt, Carrying value |  |  | $ 393,339,000 | $ 377,745,000 |  |
Unamortized debt issuance costs |  |  | 11,950,000 | 11,397,000 |  |
Amortization of debt discount and issuance costs |  |  | 11,745,000 |  |  |
Interest expense |  |  |  | 4,529,000 |  |
Coupon interest expense |  |  |  | 6,270,000 |  |
Accretion expense |  |  |  | 946,000 |  |
Convertible Senior Notes |  |  |  |  |  |
DEBT |  |  |  |  |  |
Initial conversion rate | 21.7162 |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 46.05 |  |  |  |  |
Unamortized debt issuance costs |  |  | $ 3,031,000 | $ 4,172,000 |  |
Amortization of debt discount and issuance costs | $ 888,000 |  |  |  |  |
Interest expense | 4,515,000 |  |  |  |  |
Interest and Debt Expense | 11,089,000 |  |  |  |  |
Accretion Expense | $ 5,686,000 |  |  |  |  |
Percentage of noteholders | 130.00% |  |  |  |  |
Right to receive special interest maximum term | 20 days |  |  |  |  |
Right to receive special interest maximum rate | 3000.00% |  |  |  |  |
Threshold of aggregate principal holders (percent) |  |  |  |  |  | 25.00%
Debt, principal amount | $ 140,000,000 |  |  |  |  |
Settlement period | 13 days |  |  |  |  |
Additional principal amount | $ 15,000,000 |  |  |  |  |
Convertible Senior Notes | Accounting Standards Update 2020-06 |  |  |  |  |  |
DEBT |  |  |  |  |  |
Fair value remeasurement of embedded derivative |  | $ 20,000,000 |  |  |  |
Convertible Senior Notes Due 2027 |  |  |  |  |  |
DEBT |  |  |  |  |  |
Period for discharge or stay | 40 days |  |  |  |  |
the Purchasers | Convertible Senior Notes | Convertible Debt |  |  |  |  |  |
DEBT |  |  |  |  |  |
Debt acquired |  |  |  |  | $ 8,333,000 |
Long-term debt, Carrying value |  |  |  |  | $ 131,667 |
Annual interest rate | 3.25% |  |  |  |  |

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