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Debt
 12 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Debt Debt
The following table represents our debt at carrying value at September 30, 2025 and 2024:
September 30,
2025		September 30,
2024
(In thousands)
Current maturities on debt:
     The $300 Million Term Loan
$— $15,000 
The 2018 Senior Notes400,000 — 
Less: debt issuance costs(459)— 
          Current maturities on debt399,541 15,000 
Long-term debt:
     Revolving line of credit275,000 210,000 
     The $300 Million Term Loan
— 243,750 
     The $450 Million Term Loan
— 450,000 
     The 2018 Senior Notes— 400,000 
     The 2019 Senior Notes and the 2021 Senior Notes900,000 900,000 
The 2025 Senior Notes1,500,000 — 
Less: debt issuance costs(18,850)(9,729)
           Long-term debt2,656,150 2,194,021 
           Total debt$3,055,691 $2,209,021 
Revolving Line of Credit and Term Loans
On May 13, 2025, we amended our credit agreement with a syndicate of banks, increasing our borrowing capacity under the unsecured revolving line of credit from $600 million to $1.0 billion and extending its maturity to May 13, 2030. Also on May 13, 2025, we repaid in full and terminated the $300 million unsecured term loan (the “$300 Million Term Loan”) and the $450 million unsecured term loan (the “$450 Million Term Loan”) outstanding under our credit agreement, utilizing proceeds from the issuance of the 2025 Senior Notes (as defined below). 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 September 30, 2025, we had $275.0 million in borrowings outstanding under the revolving line of credit at a weighted-average interest rate of 5.423%, 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 require interest payments semi-annually at a rate of 5.25% per annum and will mature on May 15, 2026.
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,” and collectively with the 2018 Senior Notes, the 2019 Senior Notes and the 2021 Senior Notes, the “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.
The indentures for the Senior Notes contain certain covenants typical of unsecured obligations and we were in compliance as of September 30, 2025.
The following table presents the face values and fair values for the Senior Notes at September 30, 2025 and 2024: 
 September 30, 2025September 30, 2024
 Face ValueFair ValueFace ValueFair Value
 (In thousands)
The 2018 Senior Notes$400,000 $399,500 $400,000 $399,500 
The 2019 Senior Notes and the 2021 Senior Notes900,000 875,250 900,000 864,000 
The 2025 Senior Notes1,500,000 1,518,750 — — 
      Total$2,800,000 $2,793,500 $1,300,000 $1,263,500 
Future principal payments for the Senior Notes are as follows:
Year Ending September 30,(In thousands)
2026$400,000 
2027— 
2028900,000 
2029— 
2030— 
Thereafter1,500,000 
       Total$2,800,000