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. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Earnings Per Share [Line Items]
Net earnings	$ 92,788	$ 112,788	$ 190,748	$ 208,071
Weighted average shares outstanding - basic	104,152	108,841	105,038	109,038
Dilutive effect of potential common shares	1,294	1,809	1,376	1,825
Weighted average shares outstanding - diluted	105,446	110,650	106,414	110,863
Net earnings per share - basic	$ 0.89	$ 1.04	$ 1.82	$ 1.91
Net earnings per share - diluted	$ 0.88	$ 1.02	$ 1.79	$ 1.88
Anti-dilutive employee shared based awards, excluded	657	658	1,040	883