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Convertible Senior Notes (Tables)

6 Months Ended

Mar. 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:			March 31, 2023						September 30, 2022
Principal amount			$	155,250					$	155,250
Less: unamortized discount and issuance costs, net of amortization			(23,580)						(27,280)
Carrying amount			$	131,670					$	127,970

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,
			2023						2022						2023						2022
Contractual interest expense			$	307					$	293					$	600					$	595
Amortization of debt discount and issuance costs			1,857						1,715						3,701						3,453
Total interest expense recognized			$	2,164					$	2,008					$	4,301					$	4,048

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Interest Expense

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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