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Debt
 6 Months Ended
Mar. 31, 2026
Debt Disclosure [Abstract]  
Debt Debt
The following table represents our debt at carrying value at March 31, 2026 and September 30, 2025:
March 31,
2026		September 30,
2025
(In thousands)
Current maturities on debt:
     The 2018 Senior Notes$— $400,000 
     Less: debt issuance costs— (459)
           Current maturities on debt— 399,541 
Long-term debt:
     Revolving line of credit265,000 275,000 
     The 2019 Senior Notes and the 2021 Senior Notes900,000 900,000 
     The 2025 Senior Notes1,500,000 1,500,000 
     The 2026 Senior Notes1,000,000 — 
      Less: debt issuance costs(25,937)(18,850)
           Long-term debt3,639,063 2,656,150 
           Total debt$3,639,063 $3,055,691 
Revolving Line of Credit
We have a $1.0 billion unsecured revolving line of credit with a syndicate of banks that matures on May 13, 2030. Borrowings under the revolving line of credit can be used for working capital and general corporate purposes and may also be used for the refinancing of existing debt, acquisitions, and the repurchase of our common stock. Interest rates on amounts borrowed under the revolving line of credit are based on (i) an adjusted base rate, which is the greatest of (a) the prime rate, (b) the Federal Funds rate plus 0.5%, and (c) the Daily Simple Secured Overnight Financing Rate (“SOFR”) plus 1%, plus, in each case, an applicable margin, (ii) the Daily Simple SOFR plus an applicable margin (or, if such rate is no longer available, a successor benchmark rate determined in accordance with the terms of the credit agreement), or (iii) term SOFR (without a credit spread adjustment) plus an applicable margin (or, if such rate is no longer available, a successor benchmark rate determined in accordance with the terms of the credit agreement). The applicable margin for base rate borrowings and for SOFR borrowings is determined based on our consolidated leverage ratio. The applicable margin for base rate borrowings ranges from 0% to 0.75% per annum and for SOFR borrowings ranges from 1% to 1.75% per annum. In addition, we must pay certain credit facility fees. The credit agreement contains certain restrictive covenants including a maximum consolidated leverage ratio of 3.5 to 1.0, subject to a step up to 4.0 to 1.0 following certain permitted acquisitions and subject to certain conditions, and contains other covenants typical of an unsecured credit facility.
As of March 31, 2026, we had $265.0 million in borrowings outstanding under the revolving line of credit at a weighted-average interest rate of 4.931%, and we were in compliance with all financial covenants under the credit agreement.
Senior Notes
On May 8, 2018, we issued $400 million of senior notes in a private offering to qualified institutional investors (the “2018 Senior Notes”). The 2018 Senior Notes required interest payments semi-annually at a rate of 5.25% per annum and were to mature on May 15, 2026. On March 26, 2026, prior to the maturity date, we repaid in full the 2018 Senior Notes, utilizing proceeds from the issuance of the 2026 Senior Notes (as defined below).
On December 6, 2019, we issued $350 million of senior notes in a private offering to qualified institutional investors (the “2019 Senior Notes”). The 2019 Senior Notes require interest payments semi-annually at a rate of 4.00% per annum and will mature on June 15, 2028.
On December 17, 2021, we issued $550 million of additional senior notes of the same class as the 2019 Senior Notes in a private offering to qualified institutional investors (the “2021 Senior Notes”). The 2021 Senior Notes require interest payments semi-annually at a rate of 4.00% per annum and will mature on June 15, 2028, the same date as the 2019 Senior Notes.
On May 13, 2025, we issued $1.5 billion of senior notes in a private offering to qualified institutional investors (the “2025 Senior Notes”). The 2025 Senior Notes require interest payments semi-annually at a rate of 6.00% per annum and will mature on May 15, 2033.
On March 20, 2026, we issued $1.0 billion of senior notes in a private offering to qualified institutional investors (the “2026 Senior Notes,” and collectively with the 2018 Senior Notes, the 2019 Senior Notes, the 2021 Senior Notes, and the 2025 Senior Notes, the “Senior Notes”). The 2026 Senior Notes require interest payments semi-annually at a rate of 6.25% per annum and will mature on September 15, 2034.
The indentures for the Senior Notes contain certain covenants typical of unsecured obligations and we were in compliance as of March 31, 2026.
The following table presents the face values and fair values for the Senior Notes at March 31, 2026 and September 30, 2025:
 March 31, 2026September 30, 2025
 Face ValueFair ValueFace ValueFair Value
 (In thousands)
The 2018 Senior Notes$— $— $400,000 $399,500 
The 2019 Senior Notes and the 2021 Senior Notes900,000 868,500 900,000 875,250 
The 2025 Senior Notes1,500,000 1,456,875 1,500,000 1,518,750 
The 2026 Senior Notes1,000,000 972,500 — — 
       Total $3,400,000 $3,297,875 $2,800,000 $2,793,500