Computation of Net Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 27, 2013	Dec. 28, 2012
Earnings Per Share [Line Items]
Net earnings	$ 97,960	$ 95,283
Weighted average shares outstanding – basic	105,986	109,298
Dilutive effect of potential common shares	1,463	1,846
Weighted average shares outstanding – diluted	107,449	111,144
Net earnings per share – basic	$ 0.92	$ 0.87
Net earnings per share – diluted	$ 0.91	$ 0.86
Anti-dilutive employee shared based awards, excluded	357	1,095