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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2019
Jul. 31, 2020
Sep. 26, 2020
Jun. 27, 2020
Dec. 28, 2019
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Nov. 30, 2019
Sep. 28, 2019
Jun. 30, 2013
Dec. 31, 2010
Debt Instrument [Line Items]                        
Debt extinguishment costs             $ (3,719,209)          
Current portion of long-term debt       $ 168,935,779     168,935,779     $ 12,600,131    
Loan redeption period after rdemption notice 30 days                      
Annual amount of redemption of bonds       4,500,000     $ 4,500,000          
Mandatory bonds redemption beginning period             Jan. 01, 2014          
Mandatory bonds redemption period end date             Sep. 26, 2026          
Other comprehensive expense net of income taxes       (1,554,774)   $ (1,036,759) $ (12,632,429) $ (1,191,486)        
Property and equipment with undepreciated cost pledge as collateral for long term debt       307,900,000     307,900,000          
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line       170,400,000     170,400,000          
Interest Rate Swap Two [Member]                        
Debt Instrument [Line Items]                        
Derivative notional amount       $ 149,800,000     $ 149,800,000          
Derivative, fixed interest rate       2.95%     2.95%          
Interest Rate Swap Two [Member] | One-Month LIBOR [Member]                        
Debt Instrument [Line Items]                        
Debt instrument variable interest rate             1.50%          
Interest Rate Swap [Member]                        
Debt Instrument [Line Items]                        
Derivative notional amount       $ 44,000,000.0     $ 44,000,000.0          
Derivative, fixed interest rate       3.92%     3.92%          
Other comprehensive expense net of income taxes       $ 1,200,000   $ 800,000 $ 9,500,000 900,000        
Unrealized gain on cash flow hedge             $ 14,300,000 $ 1,200,000        
Interest Rate Swap [Member] | One-Month LIBOR [Member]                        
Debt Instrument [Line Items]                        
Debt instrument variable interest rate             1.65%          
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument principal amount                     $ 700,000,000.0  
Debt instrument, redemption price as percentage of principal amount         101.917%              
Current portion of long-term debt       150,000,000     $ 150,000,000          
Maturity period of senior notes             2023          
Debt instrument stated interest rate                     5.75%  
Debt instrument outstanding balance       295,000,000.0     $ 295,000,000.0          
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on July 9, 2020 [Member]                        
Debt Instrument [Line Items]                        
Debt redemeed amount             $ 150,000,000          
Debt instrument, redemption price as percentage of principal amount             100.958%          
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on July 9, 2020 [Member] | Forecast [Member]                        
Debt Instrument [Line Items]                        
Debt extinguishment costs     $ 2,000,000.0                  
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on August 27, 2020 [Member] | Forecast [Member]                        
Debt Instrument [Line Items]                        
Debt extinguishment costs     $ 1,400,000                  
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Subsequent Event [Member] | Notes Redeemed on August 27, 2020 [Member]                        
Debt Instrument [Line Items]                        
Debt redemeed amount   $ 100,000,000                    
Debt instrument, redemption price as percentage of principal amount   100.958%                    
Secured Debt [Member] | Interest Rate Swap Two [Member]                        
Debt Instrument [Line Items]                        
Monthly principal amortization             $ 650,000          
Secured Debt [Member] | Interest Rate Swap [Member]                        
Debt Instrument [Line Items]                        
Debt maturity date             Oct. 01, 2027          
Monthly principal amortization             $ 500,000          
Recovery Zone Facility Bonds [Member]                        
Debt Instrument [Line Items]                        
Debt maturity date             Jan. 01, 2036          
Description of interest rate on bonds             The interest rate on the Bonds is equal to one-month LIBOR (adjusted monthly) plus a credit spread, adjusted to reflect the income tax exemption.          
Debt instrument outstanding balance       68,000,000.0     $ 68,000,000.0         $ 99,700,000
Credit Line [Member]                        
Debt Instrument [Line Items]                        
Line of credit facility borrowing capacity       175,000,000.0     175,000,000.0          
Borrowings outstanding       0     0          
Credit Line [Member] | Unused Letters Of Credit [Member]                        
Debt Instrument [Line Items]                        
Line of credit facility borrowing capacity       20,000,000.0     20,000,000.0          
Unused letters of credit issued       $ 9,500,000     $ 9,500,000          
Real Estate Loan (the “Loan”) [Member]                        
Debt Instrument [Line Items]                        
Debt instrument principal amount                 $ 155,000,000      
Debt instrument term 10 years                      
Debt instrument, periodic principal payment $ 650,000                      
Debt maturity date             Jan. 31, 2030          
Real Estate Loan (the “Loan”) [Member] | Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]                        
Debt Instrument [Line Items]                        
Debt extinguishment costs         $ 3,700,000