Acquisition (Business Combination) (Details) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Jul. 31, 2015 USD ($)	Jan. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Jul. 04, 2015 USD ($)	Jan. 03, 2015 USD ($)	Mar. 29, 2014 USD ($)	Nov. 03, 2015 employee	Sep. 30, 2015 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Acquisition-related cost			$ 1,200		$ 4,000
Payments to Acquire Businesses, Net of Cash Acquired			64,780		(180)
Borrowings under credit facility			50,000		35,000
Contingent Consideration Liability, Fair Value Disclosure		$ 11,750	11,750					$ 13,000
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
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		300
Business Combination, Pro Forma Information, Costs and Expenses of Acquiree since Acquisition Date, Actual		4,100
Acquired entity name: ColdLight [Member]
Acquired entity Name
payment of contingent consideration			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			0
Contingent Consideration Liability, Fair Value Disclosure		2,750	2,750
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] | Vuforia Acquisition [Member]
Acquired entity Name
Finite-lived Intangible Assets Acquired			41,200
Line of Credit [Member]
Acquired entity Name
Long-term Line of Credit		718,100	718,100
Line of Credit [Member] | Vuforia Acquisition [Member]
Acquired entity Name
Long-term Line of Credit		$ 50,000	$ 50,000