Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010
Income before income taxes:
United States	$ 141,035	$ 126,912	$ 119,729
Foreign	19,761	13,580	3,358
Total income before income tax expense	160,796	140,492	123,087
Current:
Federal	46,058	30,246	28,538
State	6,949	5,948	5,489
Foreign	8,569	9,596	600
Total current income tax expense	61,576	45,790	34,627
Deferred:
Federal	(200)	6,755	9,978
State	(622)	1,069	1,951
Foreign	(4,690)	(6,104)	(288)
Total deferred income tax expense (benefit)	(5,512)	1,720	11,641
Total income tax expense	56,064	47,510	46,268
Difference in total income tax expense from the amount computed by applying the U.S. federal statutory rate to pre-tax income
Tax at federal statutory rate	56,278	49,172	43,080
State taxes, net of federal benefit	4,932	4,376	4,787
R&E credits	(360)	(1,689)	(400)
Domestic production deduction	(774)	(770)	(714)
Tax differential on foreign earnings	(4,444)	(4,140)	(863)
Contingent consideration adjustments	(1,552)
Valuation allowance	2,512		786
Other	(528)	561	(408)
Total income tax expense	$ 56,064	$ 47,510	$ 46,268
Reconciliation of effective income tax rate
Tax at federal statutory rate (as a percent)	35.00%	35.00%	35.00%
State taxes, net of federal benefit (as a percent)	3.10%	3.10%	3.90%
R&E credits (as a percent)	(0.20%)	(1.20%)	(0.30%)
Domestic production deduction (as a percent)	(0.50%)	(0.60%)	(0.60%)
Tax differential on foreign earnings (as a percent)	(2.80%)	(3.00%)	(0.70%)
Contingent consideration adjustments (as a percent)	(1.00%)
Valuation allowance (as a percent)	1.60%		0.60%
Other (as a percent)	(0.30%)	0.50%	(0.30%)
Effective income tax rate (as a percent)	34.90%	33.80%	37.60%