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Debt
 12 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Debt Disclosure [Text Block]
8.  DEBT

Debt consists of the following:
Year Ended September 30,
20232022
Revolving loan (long-term debt)$— $82,659 
Debt issuance costs
— (1,031)
Total debt$— $81,628 

At September 30, 2023, we had no outstanding borrowings, $4,166 in outstanding letters of credit and $142,761 of availability under our revolving credit facility. Any amounts outstanding under our revolving credit facility are due and payable in September 2026, upon expiration of our revolving credit facility, and all amounts described as available are available without triggering our financial covenants under the Amended Credit Agreement (as defined below).

The interest rate under our revolving credit facility was 6.82% at September 30, 2023. For the years ended September 30, 2023, 2022 and 2021, we incurred interest expense of $3,022, $2,970 and $962, respectively.

The Revolving Credit Facility

On April 28, 2022 we entered into the Third Amended and Restated Credit and Security Agreement (the "Amended Credit Agreement"), which, among other things, increased the maximum borrowing amount under our revolving credit facility from $125,000 to $150,000. The Amended Credit Agreement also removed the aggregate cap on Company investments in certain securities and the cap on the Company’s ability to make stock repurchases, in each case subject to the satisfaction of certain liquidity requirements. The Amended Credit Agreement, which matures on September 30, 2026, contains customary affirmative, negative and financial covenants. As of September 30, 2023, the Company was in compliance with the financial covenants under the Amended Credit Agreement, requiring that we maintain:

• a Fixed Charge Coverage Ratio (as defined in the Amended Credit Agreement), measured quarterly on a trailing four-quarter basis at the end of each quarter, of at least 1.1 to 1.0; and

• minimum Liquidity of at least ten percent (10%) of the Maximum Revolver Amount, or $15,000; with, for purposes of this covenant, at least fifty percent (50%) of our Liquidity comprised of Excess Availability (as defined in the Amended Credit Agreement).

At September 30, 2023, our Liquidity was $218,531, our Excess Availability was $142,761 (or greater than 50% of minimum Liquidity), and our Fixed Charge Coverage Ratio was 6.3:1.0.