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Long-Term Debt (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jul. 31, 2020 | Jun. 30, 2020 | Nov. 30, 2019 | Dec. 31, 2010 | Jun. 26, 2021 | Sep. 26, 2020 | Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | $ (1,082,633) | $ (7,101,153) |
Other comprehensive income, net of tax |  |  |  |  |  |  |  | 6,825,156 | (8,985,646) | $ (1,265,650)
Other assets |  |  |  |  |  |  | $ 28,031,634 | 31,989,010 | 28,031,634 |
Payment of debt extinguishment costs |  |  |  |  |  |  |  |  | 5,366,350 |
Other comprehensive expense, net of income taxes |  |  |  |  |  |  |  | 9,031,156 | (11,887,660) | $ (1,674,636)
Other long-term liabilities |  |  |  |  |  |  | 55,659,943 | 50,418,947 | 55,659,943 |
Property and equipment with undepreciated cost pledge as collateral for long term debt |  |  |  |  |  |  |  | 280,200,000 |  |
Line [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 expense, net of income taxes |  |  |  |  |  |  |  | 6,800,000 | 9,000,000.0 |
Other long-term liabilities |  |  |  |  |  |  | $ 13,600,000 | 4,500,000 | $ 13,600,000 |
Interest Rate Swap at Fixed Rate of 3.92% [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  | $ 36,500,000 |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  | 3.92% |  |
Derivative maturity date |  |  |  |  |  |  |  | Oct. 01, 2027 |  |
Monthly principal amortization |  |  |  |  |  |  |  | $ 500,000 |  |
Interest Rate Swap at Fixed Rate of 3.92% [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  |  |  |  |  | 1.65% |  |
Interest Rate Swap at Fixed Rate of 2.95% [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  | $ 140,100,000 |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  | 2.95% |  |
Monthly principal amortization |  |  |  |  |  |  |  | $ 650,000 |  |
Interest Rate Swap at Fixed Rate of 2.95% [Member] | One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate |  |  |  |  |  |  |  | 1.50% |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  | $ 3,700,000 |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  | 5.75% | 5.75% | 5.75% |
Loan redeption period after rdemption notice |  |  |  | 30 days |  |  |  |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  |  | 101.917% |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  |  | $ 295,000,000.0 |  | $ 295,000,000.0 |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redemeed on July 9, 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  | 2,000,000.0 |  |  |
Debt instrument, redemption price as percentage of principal amount |  |  | 100.958% |  |  |  |  |  |  |
Debt redemeed amount |  |  | $ 150,000,000 |  |  |  |  |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redemeed on August 27, 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  | $ 1,400,000 |  |  |
Debt instrument, redemption price as percentage of principal amount |  | 100.958% |  |  |  |  |  |  |  |
Debt redemeed amount |  | $ 100,000,000 |  |  |  |  |  |  |  |
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member] | Notes Redemeed on June 26, 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | $ 1,100,000 |  |  |  |
Debt redemeed amount | 295,000,000.0 |  |  |  |  |  |  |  |  |
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% |  |
Senior Notes, Interest Rate of 4.00%, Maturing 2031 [Member] | Invested in Short Term Investments Pending Redemption Of 2023 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long term debt | $ 295,000,000.0 |  |  |  |  |  |  |  |  |
Senior Notes, Interest Rate of 4.00%, 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, Interest Rate of 4.00%, 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% |  |
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 |  |
Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  | $ 155,000,000 |  |  |  |  |  |
Debt instrument, periodic principal payment |  |  |  | $ 650,000 |  |  |  |  |  |
Debt maturity date |  |  |  |  |  |  |  | Jan. 31, 2030 |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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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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- Definition Amount, before tax and after adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge, attributable to parent. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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