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Long-term debt and lease liabilities - Senior credit facility (Details) - USD ($)
12 Months Ended 33 Months Ended
Sep. 01, 2025
Jan. 03, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Long-term debt and lease liabilities          
Proceeds from issuance of senior credit facility     $ 17,400,000    
Interest rate     0.00%   0.00%
Reduction of interest expense     $ 228,000 $ 311,000  
Current term of debt     670,000 1,122,000 $ 670,000
Interest expense     5,095,000 5,346,000  
Amortization of deferred financing costs     563,000 513,000  
Interest rate swap          
Long-term debt and lease liabilities          
Notional amount     54,000,000   54,000,000
Current term of debt     $ 670,000 $ 1,122,000 $ 670,000
Hart          
Long-term debt and lease liabilities          
Proceeds from issuance of senior credit facility to be use for business acquisition $ 17,400,000        
Minimum | Interest rate swap          
Long-term debt and lease liabilities          
Fixed SOFR rate     3.40%   3.40%
Maximum | Interest rate swap          
Long-term debt and lease liabilities          
Fixed SOFR rate     4.40%   4.40%
Weighted average | Interest rate swap          
Long-term debt and lease liabilities          
Fixed SOFR rate     6.60%   6.60%
Senior credit facility          
Long-term debt and lease liabilities          
Borrowing capacity   $ 110,000,000      
Delayed-draw term loan          
Long-term debt and lease liabilities          
Borrowing capacity   85,000,000      
Proceeds from issuance of senior credit facility         $ 83,600,000
Credit facility interest rate for unused availability     0.75%   0.75%
Term loan          
Long-term debt and lease liabilities          
Proceeds from issuance of senior credit facility   5,000,000      
Delayed Draw Term Loan and Term Loan          
Long-term debt and lease liabilities          
Weighted average interest rate     6.70%   6.70%
Floor rate     0.50%   0.50%
Spread rate     2.40%    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     us-gaap:SecuredOvernightFinancingRateSofrMember    
Repricing period     3 months    
Delayed Draw Term Loan and Term Loan | Minimum          
Long-term debt and lease liabilities          
Spread rate     2.10%    
Delayed Draw Term Loan and Term Loan | Maximum          
Long-term debt and lease liabilities          
Spread rate     2.85%    
Revolving credit facility          
Long-term debt and lease liabilities          
Borrowing capacity   $ 20,000,000      
Repricing period     3 months    
Interest rate     7.00%   7.00%
Credit facility interest rate for unused availability     0.25%   0.25%