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DEBT
 12 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
DEBT
NOTE 7 DEBT

We had the following unsecured long-term debt outstanding with maturities shown in the following table:
September 30, 2021September 30, 2020
(in thousands)Face Amount    Unamortized Discount and Debt Issuance Cost    Book Value    Face Amount    Unamortized Discount and Debt Issuance Cost    Book Value
Unsecured senior notes:
Due March 15, 20251
$487,148 $(3,662)$483,486 $487,148 $(6,421)$480,727 
Due September 29, 2031550,000 (8,003)541,997 — — — 
Total notes payable1,037,148 (11,665)1,025,483 487,148 (6,421)480,727 
Less: long-term debt due within one year$(487,148)3,662 (483,486)— — — 
Long-term debt$550,000 $(8,003)$541,997 $487,148 $(6,421)$480,727 
(1) Debt was extinguished prior to maturity date. Refer to 'Senior Notes' section below.
Senior Notes

2.90% Senior Notes due 2031 On September 29, 2021, we issued $550.0 million aggregate principal amount of the 2.90 percent 2031 Notes in an offering to persons reasonably believed to be qualified institutional buyers in the United States pursuant to Rule 144A under the Securities Act (“Rule 144A”) and to certain non-U.S. persons in transactions outside the United States pursuant to Regulation S under the Securities Act (“Regulation S”). Interest on the 2031 Notes is payable semi-annually on March 29 and September 29 of each year, commencing on March 29, 2022. The 2031 Notes will mature on September 29, 2031 and bear interest at a rate of 2.90 percent per annum.

The indenture governing the 2031 Notes contains certain covenants that, among other things and subject to certain exceptions, limit the ability of the Company and its subsidiaries to incur certain liens; engage in sale and lease-back transactions; and consolidate, merge or transfer all or substantially all of the assets of the Company. The indenture governing the 2031 Notes also contains customary events of default with respect to the 2031 Notes.
4.65% Senior Notes due 2025 On December 20, 2018, we issued approximately $487.1 million in aggregate principal amount of the 2025 Notes. Interest on the 2025 Notes was payable semi-annually on March 15 and September 15 of each year, commencing on March 15, 2019. The debt issuance cost was being amortized straight-line over the stated life of the obligation, which approximated the effective interest method.

On September 27, 2021, the Company delivered a conditional notice of optional full redemption for all of the outstanding 2025 Notes at a redemption price calculated in accordance with the indenture governing the 2025 Notes, plus accrued and unpaid interest on the 2025 Notes to be redeemed. The Company financed the redemption of the 2025 Notes with the net proceeds from the offering of the 2031 Notes, together with cash on hand. The Company’s obligation to redeem the 2025 Notes was conditioned upon the prior consummation of the issuance of the 2031 Notes, which was satisfied on September 29, 2021.

On October 27, 2021, we redeemed all of the outstanding 2025 Notes. As a result, these notes were included in the current portion of long-term debt on our Consolidated Balance Sheets as of September 30, 2021. The associated make-whole premium and accrued interest of $58.1 million and the write off of the unamortized discount and debt issuance costs of $3.7 million will be recognized during the first fiscal quarter of 2022 contemporaneously with the October 27, 2021 redemption.
Credit Facilities
On November 13, 2018, we entered into a credit agreement by and among the Company, as borrower, Wells Fargo Bank, National Association, as administrative agent, and the lenders party thereto, which was amended on November 13, 2019, providing for an unsecured revolving credit facility (as amended, the “2018 Credit Facility”), that was set to mature on November 13, 2024. On April 16, 2021, lenders with $680.0 million of commitments under the 2018 Credit Facility exercised their option to extend the maturity of the 2018 Credit Facility from November 13, 2024 to November 12, 2025. No other terms of the 2018 Credit Facility were amended in connection with this extension. The remaining $70.0 million of commitments under the 2018 Credit Facility will expire on November 13, 2024, unless extended by the applicable lender before such date.
The 2018 Credit Facility has $750.0 million in aggregate availability with a maximum of $75.0 million available for use as letters of credit. The 2018 Credit Facility also permits aggregate commitments under the facility to be increased by $300.0 million, subject to the satisfaction of certain conditions and the procurement of additional commitments from new or existing lenders. The borrowings under the 2018 Credit Facility accrue interest at a spread over either the London Interbank Offered Rate ("LIBOR") or an adjusted base rate (as defined in the credit agreement). We also pay a commitment fee on the unused balance of the facility. Borrowing spreads as well as commitment fees are determined based on the debt rating for senior unsecured debt of the Company, as determined by Moody’s and Standard & Poor’s. The spread over LIBOR ranges from 0.875 percent to 1.500 percent per annum and commitment fees range from 0.075 percent to 0.200 percent per annum. Based on the unsecured debt rating of the Company on September 30, 2021, the spread over LIBOR would have been 1.125 percent had borrowings been outstanding under the 2018 Credit Facility and commitment fees are 0.125 percent. There is a financial covenant in the 2018 Credit Facility that requires us to maintain a total funded debt to total capitalization ratio of less than or equal to 50 percent. The 2018 Credit Facility contains additional terms, conditions, restrictions and covenants that we believe are usual and customary in unsecured debt arrangements for companies of similar size and credit quality, including a limitation that priority debt (as defined in the credit agreement) may not exceed 17.5 percent of the net worth of the Company. As of September 30, 2021, there were no borrowings or letters of credit outstanding, leaving $750.0 million available to borrow under the 2018 Credit Facility.
As of September 30, 2021, we had three separate outstanding letters of credit with banks, in the amounts of $24.8 million, $3.0 million, and $2.1 million.
As of September 30, 2021, we also had a $20.0 million unsecured standalone line of credit facility, for the purpose of obtaining the issuance of international letters of credit, bank guarantees, and performance bonds. Of the $20.0 million, $7.6 million of financial guarantees were outstanding as of September 30, 2021. 
The applicable agreements for all unsecured debt contain additional terms, conditions and restrictions that we believe are usual and customary in unsecured debt arrangements for companies that are similar in size and credit quality. At September 30, 2021, we were in compliance with all debt covenants.

At September 30, 2021, aggregate maturities of long-term debt are as follows (in thousands):
Year ending September 30,    
2022$— 
2023— 
2024— 
2025— 
2026— 
Thereafter - Due 2031550,000 
$550,000