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Long-Term Debt (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2021 | Nov. 01, 2019 | Jul. 31, 2020 | Jun. 26, 2021 | Jun. 27, 2020 | Dec. 28, 2019 | Jun. 26, 2021 | Jun. 27, 2020 | Jun. 01, 2021 | Sep. 26, 2020 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  |  | $ (1,082,633) |  |  | $ (1,082,633) | $ (3,719,209) |  |  |
Current portion of long-term debt |  |  |  | 314,533,835 |  |  | 314,533,835 |  |  | $ 19,305,976 |
Proceeds invested in short term investments pending redemption of the 2023 Notes |  |  |  | 295,000,000 |  |  | 295,000,000 |  |  |  |
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 |  |  |  |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  |  |  | 298,500,000 |  |  | $ 298,500,000 |  |  |  |
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line |  |  |  | 202,600,000 |  |  | 202,600,000 |  |  |  |
Interest Rate Swap Two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | $ 142,100,000 |  |  | $ 142,100,000 |  |  |  |
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 |  |  |  | $ 38,000,000.0 |  |  | $ 38,000,000.0 |  |  |  |
Derivative, fixed interest rate |  |  |  | 3.92% |  |  | 3.92% |  |  |  |
Other comprehensive income (expense), net of income taxes |  |  |  | $ (700,000) | $ (1,200,000) |  | $ 6,500,000 | (9,500,000) |  |  |
Unrealized losses on cash flow hedge |  |  |  |  |  |  | $ (4,900,000) | $ (14,300,000) |  |  |
Interest Rate Swap [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  |  |  |  | 1.65% |  |  |  |
Senior Notes, Interest Rate of 4.000%, Maturing 2031 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |
Proceeds invested in short term investments pending redemption of the 2023 Notes |  |  |  |  |  |  |  |  | $ 295,000,000.0 |  |
Debt instrument stated interest rate |  |  |  |  |  |  |  |  | 4.00% |  |
Debt instrument outstanding balance |  |  |  | 350,000,000.0 |  |  | $ 350,000,000.0 |  |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  |  |  |  | 101.917% |  |  |  |  |
Current portion of long-term debt |  |  |  | $ 295,000,000.0 |  |  | $ 295,000,000.0 |  |  |  |
Loan redeption period after rdemption notice |  | 30 days |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  | 5.75% |  |  | 5.75% |  |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redeemed on July 9, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemeed aggregate 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 August 27, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemeed aggregate amount |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  | 100.958% |  |  |  |  |  |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Subsequent Event [Member] | Notes Redeemed on July 16, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemeed aggregate amount | $ 295,000,000.0 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
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 |  |  |  | $ 63,500,000 |  |  | $ 63,500,000 |  |  |  | $ 99,700,000
Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  | 150,000,000.0 |  |  | 150,000,000.0 |  |  |  |
Borrowings outstanding |  |  |  | 0 |  |  | 0 |  |  |  |
Credit Line [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  | $ 10,000,000.0 |  |  | $ 10,000,000.0 |  |  |  |
Real Estate Loan (the “Loan”) [Member] | Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  | $ 155,000,000 |  |  |  |  |  |  |  |  |
Debt instrument term |  | 10 years |  |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  |  |  |  | $ 3,700,000 |  |  |  |  |
Debt instrument, periodic principal payment |  | $ 650,000 |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  |  | Jan. 31, 2030 |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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