Condensed Consolidated Statements Of Income (USD $)	3 Months Ended	6 Months Ended
Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Net sales	$ 915,334,689us-gaap_SalesRevenueGoodsNet	$ 947,760,587us-gaap_SalesRevenueGoodsNet	$ 1,879,831,524us-gaap_SalesRevenueGoodsNet	$ 1,892,885,457us-gaap_SalesRevenueGoodsNet
Cost of goods sold	696,643,697us-gaap_CostOfGoodsSold	741,636,640us-gaap_CostOfGoodsSold	1,436,747,974us-gaap_CostOfGoodsSold	1,483,255,844us-gaap_CostOfGoodsSold
Gross profit	218,690,992us-gaap_GrossProfit	206,123,947us-gaap_GrossProfit	443,083,550us-gaap_GrossProfit	409,629,613us-gaap_GrossProfit
Operating and administrative expenses	185,578,000us-gaap_OperatingExpenses	178,402,604us-gaap_OperatingExpenses	372,556,852us-gaap_OperatingExpenses	355,832,785us-gaap_OperatingExpenses
Gain from sale or disposal of assets	521,222us-gaap_GainLossOnDispositionOfAssets	83,283us-gaap_GainLossOnDispositionOfAssets	639,004us-gaap_GainLossOnDispositionOfAssets	208,156us-gaap_GainLossOnDispositionOfAssets
Income from operations	33,634,214us-gaap_OperatingIncomeLoss	27,804,626us-gaap_OperatingIncomeLoss	71,165,702us-gaap_OperatingIncomeLoss	54,004,984us-gaap_OperatingIncomeLoss
Other income, net	563,966us-gaap_OtherNonoperatingIncomeExpense	737,862us-gaap_OtherNonoperatingIncomeExpense	1,126,726us-gaap_OtherNonoperatingIncomeExpense	1,577,865us-gaap_OtherNonoperatingIncomeExpense
Interest expense	11,577,970us-gaap_InterestExpense	11,698,560us-gaap_InterestExpense	23,600,880us-gaap_InterestExpense	23,480,791us-gaap_InterestExpense
Income before income taxes	22,620,210	16,843,928	48,691,548	32,102,058
Income tax expense	8,318,000us-gaap_IncomeTaxExpenseBenefit	6,389,000us-gaap_IncomeTaxExpenseBenefit	19,351,000us-gaap_IncomeTaxExpenseBenefit	12,114,000us-gaap_IncomeTaxExpenseBenefit
Net income	$ 14,302,210us-gaap_NetIncomeLoss	$ 10,454,928us-gaap_NetIncomeLoss	$ 29,340,548us-gaap_NetIncomeLoss	$ 19,988,058us-gaap_NetIncomeLoss
Class A Common Stock [Member]
Per share amounts:
Basic earnings per common share	$ 0.72	$ 0.47	$ 1.49	$ 0.91
Diluted earnings per common share	$ 0.71	$ 0.46	$ 1.45	$ 0.88
Cash dividends per common share:
Common Stock	$ 0.165	$ 0.165	$ 0.33	$ 0.33
Class B Common Stock [Member]
Per share amounts:
Basic earnings per common share	$ 0.66	$ 0.43	$ 1.36	$ 0.83
Diluted earnings per common share	$ 0.66	$ 0.43	$ 1.36	$ 0.83
Cash dividends per common share:
Common Stock	$ 0.150	$ 0.150	$ 0.30	$ 0.30

Aggregate dividends paid during the period for each share of common stock outstanding.

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