Summary Of Significant Accounting Policies (Narrative 1) (Details) (USD $)	12 Months Ended
	Sep. 27, 2014 item	Sep. 28, 2013	Sep. 29, 2012	Sep. 27, 2014 Minimum [Member]	Sep. 27, 2014 Minimum [Member] Building and improvements [Member]	Sep. 27, 2014 Minimum [Member] Machinery and equipment [Member]	Sep. 27, 2014 Maximum [Member]	Sep. 27, 2014 Maximum [Member] Building and improvements [Member]	Sep. 27, 2014 Maximum [Member] Machinery and equipment [Member]	Sep. 27, 2014 Test [Member]	Sep. 28, 2013 Test [Member]	Sep. 29, 2012 Test [Member]	Sep. 27, 2014 Test [Member] SANS [Member]	Sep. 27, 2014 Sensors [Member]	Sep. 28, 2013 Sensors [Member]	Sep. 29, 2012 Sensors [Member]	Jun. 17, 2014 Roehrig Engineering, Inc. "REI" [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum number of months for manufacturing and delivery that divides short and long term contracts for revenue recognition	6 months
Minimum number of months that long term contract may contain non-routine installations and special acceptance protocols in months	6 months
Foreign currency transaction gain (loss), before tax	$ (1,400,000)	$ (1,700,000)	$ (1,800,000)
Amortization expense on capitalized computer software	2,800,000	2,800,000	2,600,000
Capitalization of software development costs	900,000	0	500,000
Amortization expense	3,900,000	3,700,000	3,500,000
Property, plant and equipment, useful life					10 years	3 years		40 years	10 years
Number of reporting units	3
Goodwill	26,123,000	16,624,000								24,584,000	15,028,000	14,688,000	0	1,539,000	1,596,000	1,551,000	9,620,000
Goodwill impairment	0	0
Intangible assets impairment	$ 0	$ 0
Life of warranty obligations for sales that include installation services, in months				12 months			24 months
Product obligation period from date of purchase, in months				12 months			24 months
Number of previous months historical warranty claims used to calculate warranty expense percentage (in months)	12 months