Quarterly Data - Unaudited Net Sales And Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Quarterly Financial Data [Abstract]
Net sales	$ 623,224	$ 634,539	$ 637,246	$ 630,523	$ 671,424	$ 683,698	$ 649,878	$ 643,385	$ 2,525,532	$ 2,648,385	$ 2,610,311
Gross profit	188,660	190,576	173,550	183,918	199,182	202,267	196,818	199,309	736,704	797,576	783,750
Net earnings	$ 28,194	$ 36,331	$ 32,093	$ 35,265	$ 40,254	$ 48,122	$ 37,725	$ 32,097	$ 131,883	$ 158,198	$ 120,497
Net earnings per share, Basic	$ 0.76	$ 0.95	$ 0.81	$ 0.87	$ 0.94	$ 1.09	$ 0.83	$ 0.71	$ 3.39	$ 3.57	$ 2.66
Net earnings per share, Diluted	$ 0.75	$ 0.94	$ 0.80	$ 0.86	$ 0.93	$ 1.08	$ 0.82	$ 0.70	$ 3.35	$ 3.52	$ 2.63