Quarterly Data - Unaudited Net Sales And Earnings (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Interim Period, Costs Not Allocable [Line Items]
Net sales	$ 671,424	$ 683,698	$ 649,878	$ 643,385	$ 675,853	$ 670,632	$ 643,023	$ 620,803	$ 2,648,385	$ 2,610,311	$ 2,469,536
Gross profit	199,182	202,267	196,818	199,309	195,358	198,269	197,423	192,700	797,576	783,750	745,304
Net earnings	$ 40,254	$ 48,122	$ 37,725	$ 32,097	$ 15,625	$ 34,227	$ 36,527	$ 34,118	$ 158,198	$ 120,497	$ 152,462
Net earnings per share, Basic	$ 0.94	$ 1.09	$ 0.83	$ 0.71	$ 0.34	$ 0.76	$ 0.81	$ 0.75	$ 3.57	$ 2.66	$ 3.37
Net earnings per share, Diluted	$ 0.93	$ 1.08	$ 0.82	$ 0.70	$ 0.34	$ 0.75	$ 0.80	$ 0.75	$ 3.52	$ 2.63	$ 3.33