Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Income (loss) before income taxes:
United States	$ 118,900	$ 60,547	$ 141,035
Foreign	25,443	(48,015)	19,761
Total income before income taxes	144,343	12,532	160,796
Current:
Federal	26,503	11,155	46,058
State	7,551	2,705	6,949
Foreign	1,759	11,646	8,569
Total current income tax expense	35,813	25,506	61,576
Deferred:
Federal	5,957	(2,965)	(200)
State	434	(637)	(622)
Foreign	(6,536)	(7,866)	(4,690)
Total deferred income tax expense (benefit)	(145)	(11,468)	(5,512)
Total income tax expense	35,668	14,038	56,064
Reconciliation of income tax expense
Tax at federal statutory rate	50,521	4,386	56,278
State taxes, net of federal benefit	4,956	1,316	4,932
R&E credits	(867)	(6,622)	(360)
Domestic production deduction	(1,048)	(828)	(774)
Tax differential on foreign earnings	(7,956)	(4,263)	(4,444)
Corrections of prior-year errors		3,255
Goodwill and contingent consideration	(11,808)	11,288	(1,552)
Stock compensation	298	443	80
Valuation allowance	396	4,947	2,512
Other	$ 1,176	$ 116	$ (608)
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)	3.40%	10.50%	3.10%
R&E credits (as a percent)	(0.60%)	(52.80%)	(0.20%)
Domestic production deduction (as a percent)	(0.70%)	(6.60%)	(0.50%)
Tax differential on foreign earnings (as a percent)	(5.50%)	(34.00%)	(2.80%)
Corrections of prior-year errors (as a percent)		26.00%
Goodwill and contingent consideration (as a percent)	(8.20%)	90.00%	(1.00%)
Stock compensation (as a percent)	0.20%	3.50%	0.10%
Valuation allowance (as a percent)	0.30%	39.50%	1.60%
Other (as a percent)	0.80%	0.90%	(0.40%)
Total income tax expense (as a percent)	24.70%	112.00%	34.90%