Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Jul. 04, 2015	Jan. 03, 2015	Jun. 28, 2014	Mar. 29, 2014	Jul. 04, 2015	Jun. 28, 2014	Sep. 30, 2014
Income Tax Disclosure [Line Items]
Effective income tax rate	3.00%		27.00%		(1.00%)	21.00%
Income before income taxes	$ 17,939		$ 52,106		$ 52,734	$ 153,744
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	6,000				14,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions					3,100
Deferred Other Tax Expense (Benefit)		$ 1,400
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		$ 2,100
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%
Deferred Tax Liabilities, Intangible Assets				$ 8,900
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				(8,900)
Unrecognized tax benefits	11,900				11,900		$ 15,000
Income tax provision upon recognition of unrecognized tax benefit	10,300				10,300
Unrecognized tax benefits that would impact valuation allowance	3,900				3,900
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months	$ (4,000)				$ (4,000)
Adjustments to additional paid in capital, income tax benefit from share-based compensation			$ 1,500			$ 9,600
acquired entity name-ThingWorx [Member]
Income Tax Disclosure [Line Items]
Finite-lived Intangible Assets Acquired				$ 32,100