Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2015	Jan. 02, 2016	Jan. 03, 2015	Sep. 30, 2015
Financial assets:
Cash equivalents—Level 1		$ 76,480		$ 91,216
Forward contracts (2)		1,479		507
Financial assets, fair value		77,959		91,723
Financial liabilities:
Forward contracts (2)		365		46
Contingent Consideration Liability, Fair Value Disclosure		11,750		13,000
Liabilities, Fair Value Disclosure, Recurring		12,115		13,046
Level 1
Financial assets:
Cash equivalents—Level 1		76,480		91,216
Forward contracts (2)		0		0
Financial assets, fair value		76,480		91,216
Financial liabilities:
Forward contracts (2)		0		0
Contingent Consideration Liability, Fair Value Disclosure		0		0
Liabilities, Fair Value Disclosure, Recurring		0		0
Level 2
Financial assets:
Cash equivalents—Level 1		0		0
Forward contracts (2)		1,479		507
Financial assets, fair value		1,479		507
Financial liabilities:
Forward contracts (2)		365		46
Contingent Consideration Liability, Fair Value Disclosure		0		0
Liabilities, Fair Value Disclosure, Recurring		365		46
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash equivalents—Level 1		0		0
Forward contracts (2)		0		0
Financial assets, fair value		0		0
Financial liabilities:
Forward contracts (2)		0		0
Contingent Consideration Liability, Fair Value Disclosure		11,750		13,000
Liabilities, Fair Value Disclosure, Recurring		11,750		13,000
Current portion [Member]
Financial liabilities:
Contingent Consideration Liability, Fair Value Disclosure		0
acquired entity name-ThingWorx [Member]
Financial liabilities:
Contingent Consideration Liability, Fair Value Disclosure		9,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		0
Contingent consideration	$ (9,000)
acquired entity name-ThingWorx [Member] | Fair Value, Inputs, Level 3 [Member]
Financial liabilities:
Contingent Consideration Liability, Fair Value Disclosure				9,000
Acquired entity name: ColdLight [Member]
Financial liabilities:
Contingent Consideration Liability, Fair Value Disclosure		2,750
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		0
Contingent consideration		(1,250)	$ 0
Acquired entity name: ColdLight [Member] | Fair Value, Inputs, Level 3 [Member]
Financial liabilities:
Contingent Consideration Liability, Fair Value Disclosure				$ 4,000
Non-current portion [Member] [Member]
Financial liabilities:
Contingent Consideration Liability, Fair Value Disclosure		$ 1,500