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Long-Term Debt (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021	Sep. 25, 2021	Jun. 30, 2021	Jun. 26, 2021	May 31, 2021	Dec. 31, 2019	Dec. 31, 2010
Debt Instrument [Line Items]
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				Dec. 17, 2029
Derivative notional amount		136,300,000		$ 136,300,000
Other comprehensive income, net of income taxes		9,896,413	$ 6,755,876	11,763,300	$ 9,519,614
Other long-term liabilities		45,078,425	4,000,000.0	45,078,425	4,000,000.0	$ 50,418,947
Property and equipment with undepreciated cost pledge as collateral for long term debt		274,400,000		274,400,000
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line		305,900,000		305,900,000
Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Other comprehensive income, net of income taxes			$ 5,100,000		$ 7,200,000
Interest Rate Swap at Fixed Rate of 3.92% [Member]
Debt Instrument [Line Items]
Unrealized gain on cash flow hedge				(7,200,000)
Other comprehensive expense, net of income taxes		$ 7,500,000		$ 8,900,000
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]
Debt Instrument [Line Items]
Maturity period of senior notes				2031
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount								$ 350,000,000.0
Debt instrument stated interest rate		4.00%		4.00%
Secured Debt Maturing January 2030 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 155,000,000
Derivative, fixed interest rate		2.95%		2.95%
Debt instrument variable interest rate				1.50%
Monthly principal amortization				$ 650,000
Secured Debt Maturing 2037 [Member]
Debt Instrument [Line Items]
Debt maturity date	Oct. 01, 2027
Secured borrowing	$ 60,000,000
Derivative notional amount		$ 33,500,000		$ 33,500,000
Derivative, fixed interest rate		3.92%		3.92%
Derivative maturity date				Oct. 01, 2027
Monthly principal amortization				$ 500,000
Secured Debt Maturing 2037 [Member] | One-Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate				1.65%
Line of credit Maturing September 2022 [Member]
Debt Instrument [Line Items]
Line of credit facility borrowing capacity									$ 175,000,000.0
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 amount		$ 59,000,000.0		$ 59,000,000.0							$ 99,700,000
Credit Line [Member]
Debt Instrument [Line Items]
Line of credit facility borrowing capacity							$ 150.0
Credit Line [Member] | Unused Letters Of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility borrowing capacity		$ 10,000,000.0		$ 10,000,000.0

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