Acquisition (Business Combination) (Details) $ in Thousands		1 Months Ended	3 Months Ended					6 Months Ended
	Apr. 06, 2016 USD ($)	Jul. 31, 2015 USD ($)	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Jul. 04, 2015 USD ($)	Apr. 04, 2015 USD ($)	Mar. 29, 2014 USD ($)	Apr. 02, 2016 USD ($)	Apr. 04, 2015 USD ($)	Jan. 12, 2016 USD ($)	Nov. 03, 2015 employee	Sep. 30, 2015 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Acquisition-related cost			$ 1,100			$ 1,900		$ 2,300	$ 5,900
Payments to Acquire Businesses, Net of Cash Acquired								164,191	(180)
Borrowings under credit facility								170,000	35,000
Increase in estimated fair value of liability			540
Contingent Consideration Liability, Fair Value Disclosure			29,190					29,190				$ 13,000
acquired entity name-Kepware [Domain]
Acquired entity Name
Goodwill, Acquired During Period			77,081
Finite-lived Intangible Assets Acquired			34,500
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, Low			16,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired			99,410
Cash Acquired from Acquisition			$ 590
Business Combination, Acquired Receivables, Description			4293
Property and equipment acquired in business combination			$ 3,147
Deferred revenue from business combination			(2,758)
Business Combination, Consideration Transferred			116,310
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			16,900					16,900
Contingent Consideration Liability, Fair Value Disclosure			16,900					16,900
Business Acquisition, Pro Forma Revenue			4,700
Business Combination, Pro Forma Information, Costs and Expenses of Acquiree since Acquisition Date, Actual			5,000
Other misc. assets and liabilities net from business acquisition			47
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			116,900					116,900
Vuforia Acquisition [Member]
Acquired entity Name
Goodwill, Acquired During Period				$ 23,316
business combination acquired assets and liabilities net (excluding goodwill and other intangible assets)				4,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired				64,777
Cash Acquired from Acquisition				4,466
Business Combination, Number of Employees at Acquiree | employee											80
Acquired entity name: ColdLight [Member]
Acquired entity Name
Payment of contingent consideration				1,250				1,250	$ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired					$ 98,592
Cash Acquired from Acquisition					1,313
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			5,000					5,000
Contingent consideration					$ 3,800
Increase in estimated fair value of liability			540
Contingent Consideration Liability, Fair Value Disclosure			3,290					3,290
acquired entity name-ThingWorx [Member]
Acquired entity Name
Payment of contingent consideration		$ 9,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired							$ 111,500
Cash Acquired from Acquisition							$ 100
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			18,000					18,000
Increase in estimated fair value of liability								0
Contingent Consideration Liability, Fair Value Disclosure			9,000					$ 9,000
Computer Software, Intangible Asset [Member]
Acquired entity Name
Acquired finite-lived intangible asset, weighted average useful life								7 years
Computer Software, Intangible Asset [Member] | acquired entity name-Kepware [Domain]
Acquired entity Name
Finite-lived Intangible Assets Acquired			$ 28,700
Acquired finite-lived intangible asset, weighted average useful life			10 years
Computer Software, Intangible Asset [Member] | Vuforia Acquisition [Member]
Acquired entity Name
Finite-lived Intangible Assets Acquired				$ 41,200
Acquired finite-lived intangible asset, weighted average useful life				6 years
Customer Lists [Member]
Acquired entity Name
Acquired finite-lived intangible asset, weighted average useful life								10 years
Customer Lists [Member] | acquired entity name-Kepware [Domain]
Acquired entity Name
Finite-lived Intangible Assets Acquired			$ 5,200
Acquired finite-lived intangible asset, weighted average useful life			10 years
Trademarks and Trade Names [Member] | acquired entity name-Kepware [Domain]
Acquired entity Name
Finite-lived Intangible Assets Acquired			$ 600
Acquired finite-lived intangible asset, weighted average useful life			6 years
Line of Credit [Member]
Acquired entity Name
Long-term Line of Credit			$ 838,100					$ 838,100
Line of Credit [Member] | acquired entity name-Kepware [Domain]
Acquired entity Name
Long-term Line of Credit										$ 100,000
Line of Credit [Member] | Vuforia Acquisition [Member]
Acquired entity Name
Long-term Line of Credit				$ 50,000
Subsequent Event [Member] | acquired entity name-ThingWorx [Member]
Acquired entity Name
Payment of contingent consideration	$ 9,000