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Debt | 6 Months Ended
--- | ---
Mar. 31, 2026
Debt Disclosure [Abstract] |
Debt | 10. Debt As of March 31, 2026 and September 30, 2025, we had the following debt obligations:
(in thousands) |  | March 31, 2026 |  |  | September 30, 2025 |
4.000% Senior notes due 2028 |  | $ | 500,000 |  |  | $ | 500,000 |
Credit facility revolver line(1)(2) |  |  | 243,750 |  |  |  | 231,250 |
Credit facility term loan(1)(2) |  |  | 456,250 |  |  |  | 468,750 |
Total debt |  |  | 1,200,000 |  |  |  | 1,200,000 |
Unamortized debt issuance costs for the senior notes(3) |  |  | (2,028 | ) |  |  | (2,566 | )
Total debt, net of issuance costs(4) |  | $ | 1,197,972 |  |  | $ | 1,197,434 |
(1) Unamortized debt issuance costs related to the credit facility were $2.7 million included in Other current assets and $2.9 million included in Other assets on the Consolidated Balance Sheet as of March 31, 2026 and $2.7 million included in Other current assets and $3.3 million included in Other assets on the Consolidated Balance Sheet as of September 30, 2025. (2) The stated maturity date under the credit facility on which both the revolver line and the term loan will mature and all amounts then outstanding will become due and payable is January 3, 2028. The term loan began amortizing in March 2024, with payments remaining of $12.5 mi llion in 2026, $25.0 million in 2027, and $418.7 million in 2028. (3) As of March 31, 2026 and September 30, 2025, all unamortized debt issuance costs for the senior notes were included in Long-term debt on the Consolidated Balance Sheets. (4) As of March 31, 2026 and September 30, 2025, $25.0 million of debt associated with the credit facility term loan was classified as short term. Senior Unsecured Notes In February 2020, we issued $500 million in aggregate principal amount of 4.0% senior, unsecured long-term debt at par value, due in 2028 (the 2028 notes). As of March 31, 2026, the total estimated fair value of the 2028 notes was approximately $488.8 million based on quoted prices for the notes on that date. We were in compliance with all the covenants for our senior notes as of March 31, 2026. Credit Agreement Our credit facility consists of (i) a $1.25 billion revolving credit facility, (ii) a $500 million term loan credit facility, and (iii) an incremental facility pursuant to which we may incur additional term loan tranches or increase the revolving credit facility. As of March 31, 2026, unused commitments under our revolving credit facility were $1,006.3 million and the amount available to borrow was $989.2 million. As of March 31, 2026, the fair value of our credit facility approximates its book value. PTC and certain foreign subsidiaries are eligible borrowers under the credit facility. As of March 31, 2026, $46.3 million was borrowed by an eligible foreign subsidiary borrower. We were in compliance with all financial and operating covenants of the credit facility as of March 31, 2026. Loans under the credit facility bear interest at variable rates. As of March 31, 2026, the annual rate for borrowings outstanding was 5.1%. A quarterly revolving commitment fee on the undrawn portion of the revolving credit facility is required, ranging from 0.175% to 0.325% per annum, based upon our total leverage ratio. Interest We incurred interest expense on our debt of $15.3 million and $32.6 million in the second quarter and first six months of 2026, respectively, and $19.6 million and $41.7 million in the second quarter and first six months of 2025, respectively. The average interest rate on borrowings outstanding was approximately 4.7% during the second quarter and first six months of 2026, and 4.9% and 4.8% during the second quarter and first six months of 2025, respectively.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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