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Selected Quarterly Financial Data (Summary Of Selected Quarterly Financial Data) (Details) - USD ($)	3 Months Ended								12 Months Ended
	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 of Stock [Line Items]
Net sales	$ 1,089,392,000	$ 984,398,000	$ 946,152,000	$ 982,758,000	$ 962,373,000	$ 957,178,000	$ 924,312,000	$ 951,114,000	$ 4,002,699,727	$ 3,794,977,406	$ 3,778,643,782
Gross profit	261,290,000	237,134,000	228,085,000	237,084,000	237,194,000	232,854,000	228,718,000	225,639,000	963,593,003	924,405,200	893,303,800
Net income	$ 19,372,000	$ 11,527,000	$ 9,151,000	$ 13,824,000	$ 14,184,000	$ 12,668,000	$ 14,358,000	$ 12,979,000	$ 53,873,580	$ 54,189,466	$ 59,353,123
Class A Common Stock [Member]
Class of Stock [Line Items]
Basic earnings per common share	$ 0.99	$ 0.58	$ 0.47	$ 0.70	$ 0.72	$ 0.64	$ 0.73	$ 0.66	$ 2.74	$ 2.75	$ 3.02
Diluted earnings per common share	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]
Class of Stock [Line Items]
Basic earnings per common share	0.90	0.53	0.42	0.64	0.65	0.59	0.66	0.60	2.49	2.50	2.74
Diluted earnings per common share	$ 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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