Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Thermal Imaging [Member]
Summarized financial information related to the Thermal Imaging Business and is segregated from continuing operations and reported as discontinued operations
Total revenues				$ 1,983,000
Cost and expenses
Cost of revenues				1,810,000
General and administrative expense				87,000
Research and development expense				574,000
Total costs and expenses				2,470,000
Loss from operations				(488,000)
Gain on disposal, net of income taxes				7,748,000
Net earnings from discontinued operations				7,260,000
Government Business [Member]
Summarized financial information related to the Thermal Imaging Business and is segregated from continuing operations and reported as discontinued operations
Total revenues	605,000	933,000	2,119,000	3,432,000
Cost and expenses
Cost of revenues	500,000	1,569,000	3,106,000	2,495,000
General and administrative expense	231,000	194,000	1,113,000	3,032,000
Research and development expense	(62,000)	487,000	702,000	1,293,000
Total costs and expenses	669,000	2,250,000	4,921,000	6,820,000
Gain on disposal	(270,000)		(270,000)
Net earnings from discontinued operations	$ (334,000)	$ (1,317,000)	$ (3,072,000)	$ (3,388,000)