Income Taxes - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Income (loss) before income taxes:
United States	$ 113,576	$ 118,822	$ 118,900
Foreign	10,890	(38,501)	25,443
Total income before income taxes	124,466	80,321	144,343
Current:
Federal	22,277	23,836	26,503
State	5,634	5,072	7,551
Foreign	6,651	3,773	1,759
Total current income tax expense	34,562	32,681	35,813
Deferred:
Federal	6,231	7,218	5,957
State	(16)	2,335	434
Foreign	(164)	(1,141)	(6,536)
Total deferred income tax expense (benefit)	6,051	8,412	(145)
Total income tax expense	$ 40,613	$ 41,093	$ 35,668
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%	5.00%	3.40%
Research and Development ("R&D") credits (as a percent)	(3.40%)	(3.80%)	(0.60%)
Domestic production deduction (as a percent)	(0.70%)	(0.80%)	(0.70%)
Tax differential on foreign earnings (as a percent)	(5.50%)	(2.50%)	(5.50%)
Non-deductible executive compensation (as a Percent)	2.00%
Goodwill and contingent consideration (as a percent)		12.00%	(8.20%)
Stock compensation (as a percent)	0.30%	0.50%	0.20%
Valuation allowance (as a percent)	2.40%	5.70%	0.30%
Change in uncertain tax positions ( as a percent)	(2.00%)
Other (as a percent)	1.40%	0.10%	0.80%
Total income tax expense (as a percent)	32.60%	51.20%	24.70%