Acquisition (Details) $ in Thousands		3 Months Ended					9 Months Ended
	Jan. 12, 2016 USD ($)	Jul. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 02, 2016 USD ($)	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)	Sep. 30, 2016 USD ($)	Nov. 03, 2015 employee
Business Acquisition [Line Items]
Acquisition-related cost		$ 300		$ 900			$ 1,000	$ 3,200
Payments to Acquire Businesses, Net of Cash Acquired							4,960	$ 164,191
Contingent consideration related to acquisitions		7,862					7,862		$ 19,570
Acquisition							$ 2,847
Computer Software, Intangible Asset [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible asset, weighted average useful life							9 years
Customer Lists [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible asset, weighted average useful life							10 years
Line of Credit [Member]
Business Acquisition [Line Items]
Long-term portion of long term debt		218,125					$ 218,125		$ 258,125
Kepware
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 99,400
Cash Acquired from Acquisition	600
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	16,900	16,900					16,900
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		18,000					18,000
Estimated contingent consideration payment in 2017		9,600					9,600
Contingent consideration related to acquisitions		7,900					$ 7,900
Payment of contingent consideration		$ 7,800	$ 1,800
Acquisition					$ 77,100
Finite-lived Intangible Assets Acquired					34,500
Kepware | Computer Software, Intangible Asset [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired					$ 28,700
Acquired finite-lived intangible asset, weighted average useful life					10 years
Kepware | Customer Lists [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired					$ 5,200
Acquired finite-lived intangible asset, weighted average useful life					10 years
Kepware | Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired					$ 600
Acquired finite-lived intangible asset, weighted average useful life					6 years
Kepware | Line of Credit [Member]
Business Acquisition [Line Items]
Long-term portion of long term debt	$ 100,000
Vuforia Acquisition [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired						$ 64,800
Cash Acquired from Acquisition						4,500
Acquisition						23,300
Business Combination, Number of Employees at Acquiree | employee										80
Business combination acquired assets and liabilities net (excluding goodwill and other intangible assets)						4,700
Vuforia Acquisition [Member] | Computer Software, Intangible Asset [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired						$ 41,200
Acquired finite-lived intangible asset, weighted average useful life						6 years
Vuforia Acquisition [Member] | Line of Credit [Member]
Business Acquisition [Line Items]
Long-term portion of long term debt						$ 50,000