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Earnings Per Common Share (Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Jun. 24, 2017 | Mar. 25, 2017 | Dec. 24, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income allocated, basic |  |  |  |  |  |  |  |  | $ 38,393,384 | $ 38,380,304 | $ 41,356,536
Conversion of Class B to Class A shares |  |  |  |  |  |  |  |  | 15,480,196 | 15,809,162 | 17,996,587
Net income allocated, diluted |  |  |  |  |  |  |  |  | $ 53,873,580 | $ 54,189,466 | $ 59,353,123
Weighted average shares outstanding, basic |  |  |  |  |  |  |  |  | 14,039,125 | 13,943,299 | 13,711,241
Conversion of Class B to Class A shares |  |  |  |  |  |  |  |  | 6,220,651 | 6,316,477 | 6,548,534
Weighted average shares outstanding, diluted |  |  |  |  |  |  |  |  | 20,259,776 | 20,259,776 | 20,259,775
Earnings per share, Basic | $ 0.99 | $ 0.58 | $ 0.47 | $ 0.70 | $ 0.72 | $ 0.64 | $ 0.73 | $ 0.66 | $ 2.74 | $ 2.75 | $ 3.02
Earnings per share, Diluted | 0.96 | 0.57 | 0.45 | 0.68 | 0.70 | 0.63 | 0.71 | 0.64 | $ 2.66 | $ 2.68 | $ 2.93
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income allocated, basic |  |  |  |  |  |  |  |  | $ 15,480,196 | $ 15,809,162 | $ 17,996,587
Net income allocated, diluted |  |  |  |  |  |  |  |  | $ 15,480,196 | $ 15,809,162 | $ 17,996,587
Weighted average shares outstanding, basic |  |  |  |  |  |  |  |  | 6,220,651 | 6,316,477 | 6,548,534
Weighted average shares outstanding, diluted |  |  |  |  |  |  |  |  | 6,220,651 | 6,316,477 | 6,548,534
Earnings per share, Basic | 0.90 | 0.53 | 0.42 | 0.64 | 0.65 | 0.59 | 0.66 | 0.60 | $ 2.49 | $ 2.50 | $ 2.74
Earnings per share, Diluted | $ 0.90 | $ 0.53 | $ 0.42 | $ 0.64 | $ 0.65 | $ 0.59 | $ 0.66 | $ 0.60 | $ 2.49 | $ 2.50 | $ 2.74

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent, and includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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- Definition The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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