Debt (Tables)

3 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Borrowing Obligations and Applicable Margin for Borrowings

As of December 31, 2021 and September 30, 2021, we had the following borrowing obligations (dollars in thousands): 

	December 31, 2021		September 30, 2021
5.625% Senior Notes due 2026, net of deferred issuance costs of $3.1 million and $3.2 million, respectively. Effective interest rate 5.625%.	$	496,918	$	496,764
1.000% Convertible Debentures due 2035, net of unamortized discount of $5.5 million and $7.0 million, respectively, and deferred issuance costs of $0.3 million and $0.3 million, respectively. Effective interest rate 5.622%.	122,185		122,948
1.250% Convertible Debentures due 2025, net of unamortized discount of $33.6 million and $36.1 million, respectively, and deferred issuance costs of $1.4 million and $1.5 million, respectively. Effective interest rate 5.578%.	226,484		225,067
1.500% Convertible Debentures due 2035, net of unamortized discount of $0.1 million, as of September 30, 2021. Effective interest rate 5.394%.	—		24,984
Deferred issuance costs related to our Revolving Credit Facility	(1,733)		(1,839)
Total debt	843,854		867,924
Less: current portion (a)	(348,669)		(372,999)
Total long-term debt	$	495,185	$	494,925

__________(a) As of December 31, 2021, the holders have the right to convert all or any portion of the 1.25% 2025 Debentures and 1.0% 2035 Debentures between January 1, 2022 and March 31, 2022. As a result, the net carrying amounts of the convertible debentures were included in current liabilities as of December 31, 2021.

Schedule of Maturities of Long-term Debt

The following table summarizes the maturities of our borrowing obligations as of December 31, 2021 (dollars in thousands):

Fiscal Year	Convertible Debentures (a)		Senior Notes		Total
2022	$	389,392			$	389,392
2023	—		—		—
2024	—		—		—
2025	—		—		—
2026	—		—		—
Thereafter	—		500,000		500,000
Total before unamortized discount	389,392		500,000		889,392
Less: unamortized discount and issuance costs	(40,723)		(4,815)		(45,538)
Total debt	$	348,669	$	495,185	$	843,854

__________

(a) As more fully described below, as of December 31, 2021, the holders have the right to convert all or any portion of the 1.25% 2025 Debentures and 1.0% 2035 Debentures between January 1, 2022 and March 31, 2022. As a result, these convertible debentures were treated as if they were due in fiscal year 2022.