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CONVERTIBLE SENIOR NOTES (Tables)
3 Months Ended
Dec. 31, 2023
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:
December 31, 2023September 30, 2023
Principal amount$155,250 $155,250 
Less: unamortized discount and issuance costs, net of amortization(17,764)(19,734)
Carrying amount$137,486 $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 December 31,
20232022
Contractual interest expense$293 $293 
Amortization of debt discount and issuance costs1,970 1,844 
Total interest expense recognized$2,263 $2,137