Acquisition (Details) $ in Thousands		3 Months Ended
	Jan. 12, 2016 USD ($)	Dec. 31, 2016 USD ($)	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Sep. 30, 2016 USD ($)	Nov. 03, 2015 employee
Business Acquisition [Line Items]
Acquisition-related cost		$ 200		$ 1,200
Payments to Acquire Businesses, Net of Cash Acquired		0		64,780
Contingent consideration related to acquisitions		$ 16,594			$ 19,570
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		$ 238,125			$ 258,125
Acquired entity name: Kepware [Member]
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
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		18,000
Estimated contingent consideration payment in 2017		9,600
Goodwill, Acquired During Period			$ 77,100
Finite-lived Intangible Assets Acquired			34,500
Contingent consideration related to acquisitions		15,300
payment of contingent consideration		$ 1,800
Acquired entity name: Kepware [Member] | 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
Acquired entity name: Kepware [Member] | 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
Acquired entity name: Kepware [Member] | 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
Acquired entity name: Kepware [Member] | 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
Goodwill, Acquired During Period				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