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DEBT (Tables)
 6 Months Ended
Mar. 31, 2025
Debt Disclosure [Abstract]  
Schedule of Carrying Values of Company's 2026 Notes
The carrying values of the 0.75% convertible notes due 2026 issued by the Company in an initial aggregate principal amount of $155.3 million (the “2026 Notes”) are as follows (amounts in thousands):

2026 Notes:
March 31, 2025September 30, 2024
Principal amount$155,250 $155,250 
Less: unamortized discount and issuance costs, net of amortization(7,425)(11,649)
Carrying amount$147,825 $143,601 
Schedule of Interest Costs Recognized Related to 2026 Notes
The following table presents the total amount of interest cost recognized relating to the 2026 Notes (amounts in thousands):
Three Months Ended March 31,Six Months Ended March 31,
2025202420252024
Contractual interest expense$288 $298 $581 $591 
Amortization of debt discount and issuance costs2,119 2,005 4,224 3,975 
Total interest expense recognized$2,407 $2,303 $4,805 $4,566