Segment Information (Operations By Lines Of Business) (Details) - USD ($)	3 Months Ended	9 Months Ended
Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015	Sep. 26, 2015
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 957,177,645	$ 945,974,494	$ 2,832,603,557	$ 2,825,806,017
Total income from operations	31,864,964	31,114,933	96,623,387	102,280,635
Total assets	1,689,685,903		1,689,685,903		$ 1,654,828,225
Elimination of intercompany receivable
Segment Reporting Information By Segment [Line Items]
Total assets	(1,553,000)		(1,553,000)		(2,338,000)
Retail
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	922,751,000	911,698,000	2,729,293,000	2,717,538,000
Total income from operations	28,031,000	27,686,000	84,669,000	92,261,000
Total assets	1,558,365,000		1,558,365,000		1,525,682,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	34,427,000	34,276,000	103,311,000	108,268,000
Total income from operations	3,834,000	$ 3,429,000	11,954,000	$ 10,020,000
Total assets	$ 132,874,000		$ 132,874,000		$ 131,484,000