Income Taxes - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Income before income taxes:
United States	$ 166,074	$ 113,576	$ 118,822
Foreign	5,687	10,890	(38,501)
Total income before income taxes	171,761	124,466	80,321
Current:
Federal	45,604	22,277	23,836
State	8,860	5,634	5,072
Foreign	9,337	6,651	3,773
Total current income tax expense	63,801	34,562	32,681
Deferred:
Federal	(4,251)	6,231	7,218
State	(945)	(16)	2,335
Foreign	(4,761)	(164)	(1,141)
Total deferred income tax expense	(9,957)	6,051	8,412
Total income tax expense	$ 53,844	$ 40,613	$ 41,093
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%	3.10%	5.00%
Research and Development (R&D) credit (as a percent)	(1.80%)	(3.40%)	(3.80%)
Domestic production deduction (as a percent)	(0.70%)	(0.70%)	(0.80%)
Tax differential on foreign earnings (as a percent)	(0.00%)	(1.60%)	(3.80%)
Non-taxable foreign interest income (as a percent)	(2.90%)	(3.90%)	(5.90%)
Non-deductible executive compensation (as a percent)	0.00%	2.00%	0.00%
Goodwill and contingent consideration (as a percent)	0.00%	0.00%	19.20%
Stock compensation (as a percent)	(2.80%)	0.30%	0.50%
Valuation allowance (as a percent)	(0.50%)	2.40%	5.70%
Change in uncertain tax positions (as a percent)	1.80%	(2.00%)	0.00%
Other (as a percent)	(0.20%)	1.40%	0.10%
Total income tax expense (as a percent)	31.30%	32.60%	51.20%