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Debt and Credit Facilities (Tables)
 6 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Maturities of Long-term Debt [Table Text Block] (a) As of September 30, 2019, in connection with the anticipated Cerence spin-off, the holders had the right to convert all or any portion of their debentures until the close of business on October 1, 2019. As a result, the net carrying amounts of our convertible notes were included in current liabilities as of September 30, 2019. Upon the conclusion of
Borrowing Obligations and Applicable Margin for Borrowings
As of March 31, 2020 and September 30, 2019, we had the following borrowing obligations (dollars in thousands): 
 
March 31,
2020
 
September 30,
2019
5.625% Senior Notes due 2026, net of deferred issuance costs of $4.2 million and $4.5 million, respectively. Effective interest rate 5.625%.
$
495,839

 
$
495,518

6.000% Senior Notes due 2024, net of deferred issuance costs of $1.5 million. Effective interest rate 6.000%.
—

 
298,529

1.000% Convertible Debentures due 2035, net of unamortized discount of $78.4 million and $91.6 million, respectively, and deferred issuance costs of $3.6 million and $4.3 million, respectively. Effective interest rate 5.622%.
594,515

 
580,639

2.750% Convertible Debentures due 2031. Effective interest rate 7.432%.
—

 
46,568

1.250% Convertible Debentures due 2025, net of unamortized discount of $49.5 million and $71.6 million, respectively, and deferred issuance costs of $2.1 million and $3.1 million, respectively. Effective interest rate 5.578%.
211,014

 
275,257

1.500% Convertible Debentures due 2035, net of unamortized discount of $15.1 million and $22.7 million, respectively, and deferred issuance costs of $0.5 million and $0.8 million, respectively. Effective interest rate 5.394%.
211,836

 
240,406

Revolving Credit Facility, net of unamortized issuance costs of $0.3 million and $0.5 million, respectively.
229,655

 
(511
)
Total debt
1,742,859

 
1,936,406

    Less: current portion (a)
(230,000
)
 
(1,142,870
)
Total long-term debt
$
1,512,859

 
$
793,536