Earnings Per Share - 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
Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Earnings Per Share [Abstract]
Net earnings	$ 105,969us-gaap_NetIncomeLoss	$ 92,788us-gaap_NetIncomeLoss	$ 199,283us-gaap_NetIncomeLoss	$ 190,748us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic	100,157	104,152	100,315	105,038
Dilutive effect of potential common shares	869	1,294	1,026	1,376
Weighted average shares outstanding - diluted	101,026	105,446	101,341	106,414
Net earnings per share - basic (usd per share)	$ 1.06us-gaap_EarningsPerShareBasic	$ 0.89us-gaap_EarningsPerShareBasic	$ 1.99us-gaap_EarningsPerShareBasic	$ 1.82us-gaap_EarningsPerShareBasic
Net earnings per share - diluted (usd per share)	$ 1.05us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 1.97us-gaap_EarningsPerShareDiluted	$ 1.79us-gaap_EarningsPerShareDiluted
Anti-dilutive employee shared based awards, excluded	956	657	1,194	1,040

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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