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Reconciliation of Effective Income Tax Rate to Federal Rate (Detail)	12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]
Federal income tax rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	2.00%	2.10%	2.60%
Domestic production activity deduction	(2.50%)	(2.30%)	(1.70%)
Other, including tax reserves and related interest	(1.20%)	(0.20%)	(1.00%)
Effective Income Tax Rate, Continuing Operations, Total	33.30%	34.60%	34.90%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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