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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Jun. 30, 2021
Dec. 31, 2019
Sep. 30, 2017
Dec. 31, 2010
Debt Instrument [Line Items]            
Other assets $ 49,814,897 $ 44,752,886        
Property and equipment with undepreciated cost pledge as collateral for long term debt 257,200,000          
Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity 150,000,000.0          
Borrowings outstanding 0          
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity 10,000,000.0          
Borrowings outstanding 0          
Cash Flow Hedging [Member]            
Debt Instrument [Line Items]            
Other comprehensive income, net of income taxes 800,000 15,800,000        
Other assets 17,500,000          
Unrealized gains (losses) on cash flow hedge   $ 16,400,000        
Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative notional amount $ 24,500,000          
Derivative, fixed interest rate 3.962%          
Monthly principal amortization $ 500,000          
Derivative maturity date Oct. 01, 2027          
Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]            
Debt Instrument [Line Items]            
Derivative basis spread 1.75%          
Senior Notes, Maturing 2031 [Member]            
Debt Instrument [Line Items]            
Debt instrument principal amount     $ 350,000,000.0      
Debt instrument stated interest rate 4.00%   4.00%      
Senior Notes, Maturing 2031 [Member] | May Redeem Prior to June 15, 2026 [Member]            
Debt Instrument [Line Items]            
Debt instrument, redemption price as percentage of principal amount 100.00%          
Senior Notes, Maturing 2031 [Member] | May Redeem Prior to June 15, 2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument, redemption price as percentage of principal amount 104.00%          
Debt instrument redemption percentage 40.00%          
Debt instrument redemption percentage outstanding 60.00%          
Secured Debt Maturing October 2027 [Member]            
Debt Instrument [Line Items]            
Secured borrowing         $ 60,000,000  
Secured Debt Maturing January 2030 [Member]            
Debt Instrument [Line Items]            
Debt instrument principal amount       $ 155,000,000    
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative notional amount $ 124,600,000          
Derivative, fixed interest rate 2.998%          
Monthly principal amortization $ 650,000          
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]            
Debt Instrument [Line Items]            
Derivative basis spread 1.60%          
Recovery Zone Facility Bonds [Member]            
Debt Instrument [Line Items]            
Debt instrument principal amount           $ 99,700,000
Debt maturity date Jan. 01, 2036          
Annual amount of redemption of bonds $ 4,500,000