Business Acquisitions Business Acquisitions (Details textual) (USD $)	Dec. 31, 2013	Apr. 24, 2013	Dec. 28, 2012
Lorex Technology Inc. [Member]
Business Acquisition [Line Items]
Purchase price	$ 61,171,000
Net tangible assets	19,121,000
Excess purchase price	42,000,000
Finite-lived intangible asset	15,100,000
Goodwill	31,121,000
Goodwill, Expected Tax Deductible Amount	0
Traficon International NV
Business Acquisition [Line Items]
Purchase price	48,363,000	2,100,000	46,300,000
Net tangible assets	5,057,000
Excess purchase price	41,000,000
Finite-lived intangible asset	20,102,000
Goodwill	30,107,000
Goodwill, Expected Tax Deductible Amount	0
Marine & Remote Sensing Solutions [Member]
Business Acquisition [Line Items]
Purchase price	3,200,000
Finite-lived intangible asset	375,000
Goodwill	2,500,000
DigitalOptics Charlotte [Member]
Business Acquisition [Line Items]
Purchase price	14,908,000
Net tangible assets	9,987,000
Finite-lived intangible asset	2,520,000
Goodwill	2,401,000
Goodwill, Expected Tax Deductible Amount	$ 0