Segments (Sales, Based On The Customer's Location, And Property, Plant And Equipment By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 765,207	$ 740,969	$ 718,811	$ 679,676	$ 700,866	$ 692,018	$ 689,049	$ 627,535	$ 2,904,663	$ 2,709,468	$ 2,497,524
Property, plant and equipment, net	586,767				552,865				586,767	552,865	522,991
United States
Segment Reporting Information [Line Items]
Net sales									1,757,518	1,592,513	1,438,428
Property, plant and equipment, net	365,136				325,088				365,136	325,088	303,925
Germany
Segment Reporting Information [Line Items]
Net sales									213,128	202,676	195,328
Japan
Segment Reporting Information [Line Items]
Net sales									166,690	158,686	152,148
France
Segment Reporting Information [Line Items]
Net sales									143,019	138,054	145,627
Philippines
Segment Reporting Information [Line Items]
Property, plant and equipment, net	61,910				63,870				61,910	63,870	64,260
United Kingdom
Segment Reporting Information [Line Items]
Property, plant and equipment, net	56,253				61,438				56,253	61,438	64,065
Other (Non-US)
Segment Reporting Information [Line Items]
Net sales									624,308	617,539	565,993
Property, plant and equipment, net	$ 103,468				$ 102,469				$ 103,468	$ 102,469	$ 90,741