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DEBT (Tables)
 6 Months Ended
Mar. 31, 2024
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, 2024September 30, 2023
Principal amount$155,250 $155,250 
Less: unamortized discount and issuance costs, net of amortization(15,758)(19,734)
Carrying amount$139,492 $135,516 
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,
2024202320242023
Contractual interest expense$298 $307 $591 $600 
Amortization of debt discount and issuance costs2,006 1,857 3,975 3,701 
Total interest expense recognized$2,304 $2,164 $4,566 $4,301