Business Acquisitions (Narrative) (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 05, 2016	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Oct. 01, 2016
Business Acquisition [Line Items]
Total purchase price consideration, net of cash acquired				$ 1,000,000	$ 0
Operating loss		$ 2,479,000		2,773,000
Acquired receivables, gross contractual amount	$ 21,726,000
Acquired receivables, estimated uncollectible	$ 718,000
Goodwill		369,399,000		$ 369,399,000		$ 369,700,000
Weighted Average Useful Life (in Years)				15 years		15 years 1 month 6 days
Pro forma tax rate			20.00%		20.00%
Period increase pro forma weighted average shares outstanding, basic and diluted (in shares)			4,179,000		4,179,000
PCB Group, Inc
Business Acquisition [Line Items]
Business acquisition, percentage	100.00%
Total purchase price consideration, net of cash acquired	$ 581,773,000
Escrow Deposit	43,500,000
Revenues		41,739,000		$ 129,197,000
Adjustment to inventory		251,000		7,975,000
Goodwill	343,178,000
Goodwill, expected tax deductible amount		0		$ 0
Intangible assets	248,900,000
Interest expense, debt			$ 7,656,000		$ 22,968,000
Technology | PCB Group, Inc
Business Acquisition [Line Items]
Intangible assets	35,300,000
Weighted Average Useful Life (in Years)				15 years
Customer lists
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				15 years 9 months 18 days		15 years 9 months 18 days
Customer lists | PCB Group, Inc
Business Acquisition [Line Items]
Intangible assets	153,900,000
Weighted Average Useful Life (in Years)				16 years
Leasehold Interest | PCB Group, Inc
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				5 years
Trademarks and trade names
Business Acquisition [Line Items]
Weighted Average Useful Life (in Years)				25 years 5 months 20 days		25 years 6 months
Trademarks and trade names | PCB Group, Inc
Business Acquisition [Line Items]
Intangible assets	58,500,000
Weighted Average Useful Life (in Years)				3 years
Trade names
Business Acquisition [Line Items]
Indefinite lived asset		$ 57,500,000		$ 57,500,000
Line of credit | PCB Group, Inc
Business Acquisition [Line Items]
Principal amount	$ 460,000,000