Business Acquisition (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands				12 Months Ended
	Jul. 05, 2016	Jun. 29, 2015	Jun. 17, 2014	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Business Acquisition [Line Items]
Pro forma tax rate				20.00%
Period increase pro forma weighted average shares outstanding				4
Acquired receivables, gross contractual amount	$ 21,726
Acquired receivables, estimated uncollectible	$ 841
Goodwill				$ 369,700	$ 27,677	$ 26,123
Weighted Average Useful Life (in Years)				15 years 1 month 6 days	13 years 4 months 24 days
Adjustment related to finalization of purchase accounting				$ (530)	$ 1,619
PCB Group, Inc [Member]
Business Acquisition [Line Items]
Business acquisition, percentage	100.00%
Total estimated purchase price	$ 581,407
Escrow Deposit	43,500
Revenues				44,503
Operating loss				2,143
Adjustment to inventory				7,916
Interest expense, debt				22,968
Acquisition related costs	10,170
Goodwill	343,242
Goodwill, expected tax deductible amount				0
Intangible assets	248,900
Instrument And Calibration Sweden AB (ICS) [Member]
Business Acquisition [Line Items]
Total estimated purchase price		$ 667
Roehrig Engineering, Inc. "REI" [Member]
Business Acquisition [Line Items]
Total estimated purchase price			$ 14,842
Escrow Deposit			$ 2,000
Maximum [Member] | Roehrig Engineering, Inc. "REI" [Member]
Business Acquisition [Line Items]
Estimated earn-out-based contingent consideration				$ 2,000
Technology [Member]
Business Acquisition [Line Items]
Intangible assets	35,300
Technology [Member] | PCB Group, Inc [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				15 years
Customer Lists [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				15 years 9 months 18 days	8 years 1 month 6 days
Customer Lists [Member] | PCB Group, Inc [Member]
Business Acquisition [Line Items]
Intangible assets	153,900
Weighted Average Useful Life (in Years)				16 years
Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				25 years 6 months	29 years 4 months 24 days
Trademarks and Trade Names [Member] | PCB Group, Inc [Member]
Business Acquisition [Line Items]
Intangible assets	58,500
Weighted Average Useful Life (in Years)				3 years
Leasehold Interest [Member] | PCB Group, Inc [Member]
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				5 years 5 months
Trade Names [Member]
Business Acquisition [Line Items]
Indefinite lived asset				$ 57,500
Line of Credit [Member] | PCB Group, Inc [Member]
Business Acquisition [Line Items]
Principal amount	$ 460,000
Test [Member]
Business Acquisition [Line Items]
Goodwill				25,022	$ 26,243	$ 24,584
Adjustment related to finalization of purchase accounting				$ (530)	$ 1,619