Computation of Net Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Mar. 29, 2013	Mar. 30, 2012
Computation Of Earnings Per Share Line Items
Net earnings	$ 112,788	$ 107,772	$ 208,071	$ 198,006
Weighted average shares outstanding-basic	108,841	112,354	109,038	112,282
Dilutive effect of potential common shares	1,809	2,159	1,825	2,146
Weighted average shares outstanding-diluted	110,650	114,513	110,863	114,428
Net earnings per share-basic	$ 1.04	$ 0.96	$ 1.91	$ 1.76
Net earnings per share-diluted	$ 1.02	$ 0.94	$ 1.88	$ 1.73
Anti-dilutive employee shared based awards, excluded	658	744	883	250