XML 36 R26.htm IDEA: XBRL DOCUMENT v3.24.2.u1
N-2 - $ / shares
9 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Cover [Abstract]        
Entity Central Index Key 0001476765      
Amendment Flag false      
Securities Act File Number 814-00794      
Document Type 10-Q      
Entity Registrant Name Golub Capital BDC, Inc.      
Entity Address, Address Line One 200 Park Avenue      
Entity Address, Address Line Two 25th Floor      
Entity Address, City or Town New York      
Entity Address, State or Province NY      
Entity Address, Postal Zip Code 10166      
City Area Code 212      
Local Phone Number 750-6060      
Entity Emerging Growth Company false      
General Description of Registrant [Abstract]        
Investment Objectives and Practices [Text Block]
Our investment objective is to generate current income and capital appreciation by investing primarily in one stop (a loan that combines characteristics of traditional first lien senior secured loans and second lien or subordinated loans and that are often referred to by other middle-market lenders as unitranche loans) and other senior secured loans of U.S. middle-market companies. We also selectively invest in second lien and subordinated loans of, and warrants and minority equity securities in U.S. middle-market companies. We intend to achieve our investment objective by (1) accessing the established loan origination channels developed by Golub Capital, a leading lender to U.S. middle-market companies with over $70.0 billion in capital under management as of April 1, 2024, (2) selecting investments within our core middle-market company focus, (3) partnering with experienced private equity firms, or sponsors, in many cases with whom Golub Capital has invested alongside in the past, (4) implementing the disciplined underwriting standards of Golub Capital and (5) drawing upon the aggregate experience and resources of Golub Capital.
     
Risk Factors [Table Text Block] Item 1A: Risk Factors.
There have been no material changes during the three months ended June 30, 2024 to the risk factors discussed in Item 1A. Risk Factors in our annual report on Form 10-K for the year ended September 30, 2023 and our quarterly report on Form 10-Q for the quarter ended December 31, 2023.
     
NAV Per Share $ 15.32 $ 15.02 $ 14.83 $ 14.89
2028 Notes [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Structuring [Text Block] On December 5, 2023, the Company issued $450,000 in aggregate principal amount of unsecured notes (the “2028 Notes”). As of June 30, 2024, the outstanding aggregate principal amount of the 2028 Notes was $450,000. The 2028 Notes bear interest at a rate of 7.050% per year payable semi-annually in arrears on June 5 and December 5 of each year, commencing on June 5, 2024. The 2028 Notes mature on December 5, 2028.
The 2028 Notes are the Company’s general unsecured obligations that rank senior in right of payment to all of the Company’s future indebtedness or other obligations that are expressly subordinated, or junior, in right of payment to the 2028 Notes; equal in right of payment to the Company’s existing and future indebtedness or other obligations that are not so subordinated or junior; effectively junior to any of the Company’s secured indebtedness or other obligations (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness and other obligations (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.

At any time or from time to time, the Company may redeem some or all of the 2028 Notes at a redemption price equal to the greater of (1) 100% of the principal amount of the 2028 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date on the 2028 Notes on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 45 basis points less interest accrued to the date of redemption. If the Company redeems any 2028 Notes on or after November 5, 2028 (the date falling one month prior to the maturity date of the 2028 Notes), the redemption price for the 2028 Notes will be equal to 100% of the principal amount of the 2028 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. No sinking fund is provided for the 2028 Notes.

On December 5, 2023, the Company entered into an interest rate swap on the 2028 Notes with SMBC as the counterparty. Under the terms of the agreement, the Company agreed to receive a fixed rate of 7.310% and pay SMBC a rate of one-month Term SOFR + 3.327%. The interest rate swap is designated as an effective hedge
accounting instrument. The notional amount of the swap is $225,000 and terminates on November 5, 2028. The carrying value of the 2028 Notes is inclusive of an adjustment for the change in fair value of an effective hedge accounting relationship. See Note 5 for additional information.

On April 11, 2024, the Company entered into an interest rate swap on the 2028 Notes pursuant to which the Company agreed to receive a fixed rate of 7.310% and pay a rate of one-month SOFR plus 2.835%. The interest rate swap is designated as an effective hedge accounting instrument. The notional amount of the swap is $225,000 and terminates on November 5, 2028. The carrying value of the 2028 Notes is inclusive of an adjustment for the change in fair value of an effective hedge accounting relationship. See Note 5 for additional information.
     
2029 Notes [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Structuring [Text Block] On February 1, 2024, the Company issued $600,000 in aggregate principal amount of unsecured notes (the “2029 Notes”). As of June 30, 2024, the outstanding aggregate principal amount of the 2029 Notes was $600,000. The 2029 Notes bear interest at a rate of 6.000% per year payable semi-annually in arrears on January 15 and July 15 of each year, commencing on July 15, 2024. The 2029 Notes mature on July 15, 2029.
The 2029 Notes are the Company’s general unsecured obligations that rank senior in right of payment to all of the Company’s future indebtedness or other obligations that are expressly subordinated, or junior, in right of payment to the 2029 Notes; equal in right of payment to the Company’s existing and future indebtedness or other obligations that are not so subordinated or junior; effectively junior to any of the Company’s secured indebtedness or other obligations (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness and other obligations (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.

At any time or from time to time, the Company may redeem some or all of the 2029 Notes at a redemption price equal to the greater of (1) 100% of the principal amount of the 2029 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date on the 2029 Notes on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 35 basis points less interest accrued to the date of redemption. If the Company redeems any 2029 Notes on or after June 15, 2029 (the date falling one month prior to the maturity date of the 2029 Notes), the redemption price for the 2029 Notes will be equal to 100% of the principal amount of the 2029 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. No sinking fund is provided for the 2029 Notes.

On February 1, 2024, the Company entered into an interest rate swap on the 2029 Notes with SMBC as the counterparty. Under the terms of the agreement, the Company agreed to receive a fixed rate of 6.248% and pay SMBC a rate of one-month Term SOFR + 2.444%. The interest rate swap is designated as an effective hedge accounting instrument. The notional amount of the swap is $600,000 and terminates on June 15, 2029. The carrying
value of the 2029 Notes is inclusive of an adjustment for the change in fair value of an effective hedge accounting relationship. See Note 5 for additional information.
     
2018 Debt Securitization [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] 2018 Debt Securitization      
Long Term Debt, Structuring [Text Block] On November 16, 2018, the Company completed a $602,400 term debt securitization (the “2018 Debt Securitization”). The notes offered in the 2018 Debt Securitization (the “2018 Notes”) were issued by the 2018 Issuer, a subsidiary of 2018 CLO Depositor, and are backed by a diversified portfolio of senior secured and second lien loans. The transaction was executed through a private placement of approximately $327,000 of AAA/AAA Class A 2018 Notes, which bear interest at three-month LIBOR plus 1.48%; $61,200 of AA Class B 2018 Notes, which bear interest at three-month LIBOR plus 2.10%; $20,000 of A Class C-1 2018 Notes, which bear interest at three-month LIBOR plus 2.80%; $38,800 of A Class C-2 2018 Notes, which bear interest at three-month LIBOR plus 2.65%; $42,000 of BBB- Class D 2018 Notes, which bear interest at three-month LIBOR plus 2.95%; and $113,400 of Subordinated 2018 Notes which do not bear interest. The Company indirectly retained all of the Class C-2, Class D and Subordinated 2018 Notes.
Through January 20, 2023, the 2018 Issuer was permitted to use all principal collections received on the underlying collateral to purchase new collateral under the direction of the Investment Adviser, in its capacity as collateral manager of the 2018 Issuer and in accordance with the Company’s investment strategy, allowing the Company to maintain the initial leverage in the 2018 Debt Securitization. For the three and nine months ended June 30, 2024, the Company had repayments on the 2018 Notes of $38,989 and $80,703, respectively. For each of the three and nine months ended June 30, 2023, the Company had repayments on the 2018 Notes of $4,820. The 2018 Notes are scheduled to mature on January 20, 2031. The Class A, Class B and Class C-1 2018 Notes are included in the June 30, 2024 and September 30, 2023 Consolidated Statements of Financial Condition as debt of the Company. As of June 30, 2024 and September 30, 2023, the Class C-2, Class D and Subordinated 2018 Notes were eliminated in consolidation.
     
GCIC 2018 Debt Securitization [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] GCIC 2018 Debt Securitization      
Long Term Debt, Structuring [Text Block] Effective September 16, 2019, the Company assumed, as a result of the GCIC Merger, a $908,195 term debt securitization (the “GCIC 2018 Debt Securitization”). The GCIC 2018 Debt Securitization was originally completed on December 13, 2018. The notes offered in the GCIC 2018 Debt Securitization (the “GCIC 2018 Notes”) were issued by the GCIC 2018 Issuer, a subsidiary of GCIC 2018 CLO Depositor, and are secured by a diversified portfolio of senior secured and second lien loans. The GCIC 2018 Debt Securitization consists of $490,000 of AAA/AAA Class A-1 GCIC 2018 Notes, $38,500 of AAA Class A-2 GCIC 2018 Notes, and $18,000 of AA Class B-1 GCIC 2018 Notes. In partial consideration for the loans transferred to the GCIC 2018 Issuer as part of the GCIC 2018 Debt Securitization, the GCIC 2018 CLO Depositor received and retained $27,000 of Class B-2 GCIC 2018 Notes, $95,000 of Class C GCIC 2018 Notes and $60,000 of Class D GCIC 2018 Notes and $179,695 of Subordinated GCIC 2018 Notes. On December 21, 2020, the Company and the GCIC 2018 Issuer amended the GCIC 2018 Debt Securitization to, among other things, (a) refinance the issued Class A-2 GCIC 2018 Notes issued by the GCIC 2018 Issuer by redeeming in full the $38,500 of Class A-2 GCIC 2018 Notes and issuing new Class A-2-R GCIC 2018 Notes in an aggregate principal amount of $38,500 that bear interest at a rate of 2.498%, which is a decrease from the rate of 4.665% of the Class A-2 GCIC 2018 Notes and (b) provide for a non-called period, during which the Class A-2-R GCIC 2018 Notes cannot be redeemed, from December 21, 2020 to but excluding June 21, 2021. The Class A-1, Class A-2-R and Class B-1 GCIC 2018 Notes are included in the June 30, 2024 and September 30, 2023 Consolidated Statements of Financial Condition as debt of the Company. As of June 30, 2024 and September 30, 2023, the Class B-2, Class C and Class D GCIC 2018 Notes and the Subordinated GCIC 2018 Notes were eliminated in consolidation.Through January 20, 2023, the GCIC 2018 Issuer was permitted to use all principal collections received on the underlying collateral to purchase new collateral under the direction of the Investment Adviser in its capacity as collateral manager of the GCIC 2018 Issuer and in accordance with the Company’s investment strategy, allowing the Company to maintain the initial leverage in the GCIC 2018 Debt Securitization.      
GBDC 3 2021 Debt Securitization [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] GBDC 3 2021 Debt Securitization      
Long Term Debt, Structuring [Text Block] Effective June 3, 2024, the Company assumed, as a result of the GBDC 3 Merger, a $398,850 term debt securitization (the “GBDC 3 2021 Debt Securitization”). The GBDC 3 2021 Debt Securitization was originally completed on March 11, 2021. The notes offered in the GBDC 3 2021 Debt Securitization (the “GBDC 3 2021 Notes”) were issued by the GBDC 3 2021 Issuer and are backed by a diversified portfolio of senior secured and second lien loans. The GBDC 3 2021 Notes offered in the GBDC 3 2021 Debt Securitization consist of $224,000 of AAA Class A GBDC 3 2021 Notes, which bear interest at the three-month SOFR plus 1.60%; $28,000 of AA Class B GBDC 3 2021 Notes, which bear interest at the three-month SOFR plus 1.85%; $36,000 of A Class C-1 GBDC 3 2021 Notes, which bear interest at the three-month SOFR plus 2.80%; $10,000 A Class C-2 GBDC 3 2021 Notes, which bear interest at 3.91%; up to $28,000 of BBB- Class D GBDC 3 2021 Notes, which were unfunded on the closing date of the GBDC 3 2021 Debt Securitization and which, if funded, will bear interest at the three-month SOFR plus a spread set in connection with the funding date but which in no event will be greater than 5.00% (the Class D GBDC 3 2021 Notes, together with the Class A GBDC 3 2021 Notes, the Class B GBDC 3 2021 Notes, the Class C-1 GBDC 3 2021 Notes and the Class C-2 GBDC 3 2021 Notes are referred to as the “Secured GBDC 3 2021 Notes”); and approximately $100,850 of Subordinated GBDC 3 2021 Notes, which do not bear interest. The Class A GBDC 3 2021 Notes, the Class B GBDC 3 2021 Notes, the Class C-1 GBDC 3 2021 Notes, and the Class C-2 GBDC 3 2021 Notes were issued through a private placement through Deutsche Bank Securities Inc. The GBDC 3 2021 Issuer indirectly retained all of the Class D GBDC 3 2021 Notes and Subordinated GBDC 3 2021 Notes which were eliminated in consolidation. The Class A, Class B, Class C-1, and Class C-2 GBDC 3 2021 Notes are included in the June 30, 2024 Consolidated Statements of Financial Condition as debt of the Company.      
GBDC 3 2022 Debt Securitization [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] GBDC 3 2022 Debt Securitization      
Long Term Debt, Structuring [Text Block] Effective June 3, 2024, the Company assumed, as a result of the GBDC 3 Merger, a $401,750 asset-backed securitization (the “GBDC 3 2022 Debt Securitization”). The GBDC 3 2022 Debt Securitization was originally completed on January 25, 2022. The notes offered in the GBDC 3 2022 Debt Securitization were issued by the GBDC 3 2022 Issuer and are backed by a diversified portfolio of senior secured loans. The notes offered in the GBDC 3 2022 Debt Securitization consist of $252,000 of Class A Senior Secured Floating Rate Notes, which bear interest at a benchmark interest rate, which will be based on three-month term SOFR, plus 2.00% (the “Secured GBDC 3 2022 Notes”) and $149,750 of Subordinated Notes, which do not bear interest (the “Subordinated GBDC 3 2022 Notes” and, together with the Secured GBDC 3 2022 Notes, the “GBDC 3 2022 Notes”). The Secured GBDC 3 2022 Notes were issued through a private placement through Deutsche Bank Securities Inc. The GBDC 3 2022 Issuer indirectly retained all of the Subordinated GBDC 3 2022 Notes, and the Subordinated GBDC 3 2022 Notes were eliminated in consolidation. The Secured GBDC 3 2022 Notes are included in the June 30, 2024 Consolidated Statements of Financial Condition as debt of the Company.      
GBDC 3 2022-2 Debt Securitization [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] GBDC 3 2022-2 Debt Securitization      
Long Term Debt, Structuring [Text Block] Effective June 3, 2024, the Company assumed, as a result of the GBDC 3 Merger, a $386,600 term debt securitization (the “GBDC 3 2022-2 Debt Securitization”). The GBDC 3 2022-2 Debt Securitization was originally completed on December 14, 2022. The notes offered in the GBDC 3 2022-2 Debt Securitization (the “GBDC 3 2022-2 Notes”) were issued by the GBDC 3 2022-2 Issuer and are backed by a diversified portfolio of senior secured and second lien loans. The GBDC 3 2022-2 Notes offered in the GBDC 3 2022-2 Debt Securitization consist of $140,000 of AAA Class A GBDC 3 Senior Secured Floating Rate Notes due 2034, which bear interest at the three-month term SOFR plus 2.60%; $38,800 of AA Class B GBDC 3 Senior Secured Floating Rate Notes due 2034, which bear interest at the three-month term SOFR plus 3.09% (the “Class B GBDC 3 2022-2 Notes” and, together with the Class A GBDC 3 2022-2 Notes, the “Secured GBDC 3 2022-2 Notes”); $85,000 of AAA Class A GBDC 3 Senior Secured Floating Rate Loans maturing 2034, which bear interest at the three-month term SOFR plus 2.60% (the “Class A GBDC 3 2022-2 Loans” and, together with the Secured GBDC 3 2022-2 Notes, the “Secured GBDC 3 2022-2 Debt”); and $122,800 of Subordinated Notes due 2122 (the “Subordinated GBDC 3 2022-2 Notes”), which do not bear interest. The GBDC 3 2022-2 Issuer indirectly retained all of the Class B GBDC 3 2022-2 Notes and Subordinated GBDC 3 2022-2 Notes which were eliminated in consolidation. The Class A GBDC 3 2022-2 Notes and Class A GBDC 3 2022-2 Loans are included in the June 30, 2024 Consolidated Statement of Financial Condition as debt of the Company.      
Credit Facility JPM [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] JPM Credit Facility      
Long Term Debt, Structuring [Text Block]
JPM Credit Facility: On February 11, 2021, the Company entered into a senior secured revolving credit facility (as amended, the “JPM Credit Facility”) with the Company, as borrower, JPMorgan Chase Bank N.A., as administrative agent and as collateral agent, and the lenders from time to time party thereto which, as of June 30, 2024, allowed the Company to borrow up to $1,487,500 in U.S. dollars and certain agreed upon foreign currencies, subject to leverage and borrowing base restrictions. Through a series of amendments, most recently on June 7, 2024, the Company amended the JPM Credit Facility to, among other things, extend the maturity date to March 17, 2028, decrease the adjustment to term SOFR for loans using such rate to 0.10%, increase the accordion feature to allow the Company to request, at one or more times, that existing and/or new lenders, at their election provide up to $512,500 of additional commitments and update the applicable reference rate with respect to borrowings denominated in Canadian Dollars with CORRA.
The JPM Credit Facility provides for the issuance of letters of credit in an initial aggregate face amount of up to $23,750, subject to increase or reduction from time to time pursuant to the terms of the JPM Credit Facility.
The JPM Credit Facility is secured by a first priority security interest in substantially all of the assets of the Company and certain of the Company’s subsidiaries thereunder.
     
Long Term Debt, Dividends and Covenants [Text Block]
Borrowings under the JPM Credit Facility bear interest at the applicable base rate plus a margin of either 1.75% or 1.875%, subject to compliance with a borrowing base test. The applicable base rate under the JPM Credit Facility is (i) one-month SOFR with respect to any advances denominated in U.S. dollars, (ii) SONIA with respect to any advances denominated in U.K. pound sterling, (iii) one-month EURIBOR with respect to any advances denominated in euros, (iv) CORRA with respect to any advances denominated in Canadian Dollars, and (v) the relevant rate as defined in the JPM Credit Facility for borrowings in other currencies. Effective September 13, 2022, interest under the JPM Facility for loans denominated in SOFR were converted to reference a benchmark rate of term SOFR plus an adjustment of an amount ranging between 0.11448% and 0.42826% (subject to applicable tenor). Effective March 17, 2023, the adjustment to term SOFR was reduced to 0.10%.
The Company pays a commitment fee of 0.375% per annum on the daily unused portion of commitments under the JPM Credit Facility. The Company is also required to pay letter of credit participation fees and a fronting fee on the daily amount of any lender’s exposure with respect to any letters of credit issued at the request of the Company under the JPM Credit Facility. The JPM Credit Facility matures on March 17, 2028 and requires mandatory prepayment of interest and principal upon certain events during the one year amortization period of the facility.
     
2024 Notes [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] 2024 Notes      
Long Term Debt, Structuring [Text Block] On October 2, 2020, the Company issued $400,000 in aggregate principal amount of unsecured notes (the “2024 Notes”), and on October 15, 2021, the Company issued an additional $100,000 in aggregate principal amount of 2024 Notes under the same terms of the original issuance. On April 8, 2024, the Company redeemed $500,000 in aggregate principal amount of the 2024 Notes. The 2024 Notes were redeemed at 100% of the principal amount, plus the accrued and unpaid interest thereon. As of September 30, 2023, the outstanding aggregate principal amount of the 2024 Notes was $500,000. The 2024 Notes bore interest at a rate of 3.375% per year payable semiannually in arrears on April 15 and October 15 of each year, commencing on April 15, 2021.
The 2024 Notes were the Company’s general unsecured obligations that ranked senior in right of payment to all of the Company’s future indebtedness or other obligations that are expressly subordinated, or junior, in right of payment to the 2024 Notes; equal in right of payment to the Company’s existing and future indebtedness or other obligations that are not so subordinated or junior; effectively junior to any of the Company’s secured indebtedness or other obligations (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness and other obligations (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.
     
Notes 2026 [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] 2026 Notes      
Long Term Debt, Structuring [Text Block] On February 24, 2021, the Company issued $400,000 in aggregate principal amount of unsecured notes (the “2026 Notes”) and on October 13, 2021, the Company issued an additional $200,000 aggregate principal amount of 2026 Notes under the same terms as the original issuance. As of both June 30, 2024 and September 30, 2023, outstanding aggregate principal amount of the 2026 Notes was $600,000. The 2026 Notes bear interest at a rate of 2.500% per year payable semiannually in arrears on February 24 and August 24 of each year, commencing on August 24, 2021. The 2026 Notes mature on August 24, 2026.
The 2026 Notes are the Company’s general unsecured obligations that rank senior in right of payment to all of the Company’s future indebtedness or other obligations that are expressly subordinated, or junior, in right of payment to the 2026 Notes; equal in right of payment to the Company’s existing and future indebtedness or other obligations that are not so subordinated or junior; effectively junior to any of the Company’s secured indebtedness or other obligations (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness and other obligations (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.
At any time or from time to time, the Company may redeem some or all of the 2026 Notes at a redemption price equal to the greater of (1) 100% of the principal amount of the 2026 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the 2026 Notes to be redeemed through July 24, 2026 (the date falling one month prior to the maturity date of the 2026 Notes), discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 30 basis points, plus, in each case, accrued and unpaid interest, if any, to, but excluding, the redemption date; provided, however, that if the Company redeems any 2026 Notes on or after July 24, 2026 (the date falling one month prior to the maturity date of the 2026 Notes), the redemption price for the 2026 Notes will be equal to 100% of the principal amount of the 2026 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. No sinking fund is provided for the 2026 Notes.
     
Notes 2027 [Member]        
Capital Stock, Long-Term Debt, and Other Securities [Abstract]        
Long Term Debt, Title [Text Block] 2027 Notes      
Long Term Debt, Structuring [Text Block] On August 3, 2021, the Company issued $350,000 in aggregate principal amount of unsecured notes (the “2027 Notes”). As of both June 30, 2024 and September 30, 2023, outstanding aggregate principal amount of the 2027 Notes was $350,000. The 2027 Notes bear interest at a rate of 2.050% per year payable semi-annually in arrears on February 15 and August 15 of each year, commencing on February 15, 2022. The 2027 Notes mature on February 15, 2027.
The 2027 Notes are the Company’s general unsecured obligations that rank senior in right of payment to all of the Company’s future indebtedness or other obligations that are expressly subordinated, or junior, in right of payment to the 2027 Notes; equal in right of payment to the Company’s existing and future indebtedness or other obligations that are not so subordinated or junior; effectively junior to any of the Company’s secured indebtedness or other obligations (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets
securing such indebtedness; and structurally junior to all existing and future indebtedness and other obligations (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.
At any time or from time to time, the Company may redeem some or all of the 2027 Notes at a redemption price equal to the greater of (1) 100% of the principal amount of the 2027 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the 2027 Notes to be redeemed through January 15, 2027 (the date falling one month prior to the maturity date of the 2027 Notes), discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 25 basis points, plus, in each case, accrued and unpaid interest, if any, to, but excluding, the redemption date; provided, however, that if the Company redeems any 2027 Notes on or after January 15, 2027 (the date falling one month prior to the maturity date of the 2027 Notes), the redemption price for the 2027 Notes will be equal to 100% of the principal amount of the 2027 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. No sinking fund is provided for the 2027 Notes.