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Segment Information and Enterprise Reporting - Analysis of Product Revenues Based upon Geographic Area Shipped (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015	Sep. 27, 2014
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 164,607	$ 147,612	$ 327,897	$ 294,969	$ 294,969
Total product revenue, in percentage	100.00%	100.00%	100.00%		100.00%
North and South America | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 4,972	$ 4,290	$ 9,206	$ 8,492
Total product revenue, in percentage	3.00%	2.90%	2.80%	2.90%
Europe, Middle East and Africa | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 25,988	$ 24,335	$ 57,958	$ 48,396
Total product revenue, in percentage	15.80%	16.50%	17.70%	16.40%
Asia and Australia | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 16,602	$ 12,751	$ 30,184	$ 24,569
Total product revenue, in percentage	10.10%	8.60%	9.20%	8.30%
United States | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 117,045	$ 106,236	$ 230,549	$ 213,512
Total product revenue, in percentage	71.10%	72.00%	70.30%	72.40%

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