Business Segment Information (Geographical Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 787,955	$ 650,147	$ 563,934
Property and Equipment, Net	99,930	100,789	80,454
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	246,679	154,707	151,288
Property and Equipment, Net	78,080	79,794	59,312
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	192,491	163,944	149,308
Property and Equipment, Net	15,296	13,695	13,071
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	174,044	152,264	131,727
Property and Equipment, Net	5,542	5,630	6,260
Asia, Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	142,644	148,056	109,376
Property and Equipment, Net	1,012	1,670	1,811
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 32,097	$ 31,176	$ 22,235