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DEBT - Convertible Senior Notes Narrative (Details)
 12 Months Ended
Nov. 27, 2021
USD ($)
day
$ / shares
Nov. 04, 2021
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 13, 2024
USD ($)
Sep. 27, 2021
DEBT              
Long-term debt, Carrying value     $ 402,123,000 $ 393,339,000      
Unamortized debt issuance costs     9,576,000 11,950,000      
Amortization of debt discount and issuance costs     11,681,000   $ 11,089,000    
Interest expense       4,282,000 4,515,000    
Coupon interest expense       6,461,000 5,686,000    
Accretion expense       938,000 $ 888,000    
Convertible Senior Notes              
DEBT              
Initial conversion rate 21.7162            
Initial conversion price (in dollars per share) | $ / shares $ 46.05            
Unamortized debt issuance costs     $ 2,093,000 $ 3,031,000      
Amortization of debt discount and issuance costs $ 946,000            
Interest expense 4,529,000            
Interest and debt expense 11,745,000            
Accretion expense $ 6,270,000            
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 60 days            
Right to receive special interest maximum term 180 days            
Right to receive special interest maximum rate 0.50%            
Cure period 30 days            
Cure or waiver period 60 days            
Number of scheduled trading days | day 40            
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%