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Property and Equipment Property and Equipment (Details) $ in Thousands		3 Months Ended
	Jan. 26, 2016 ft²	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Occupied Square Feet | ft²	70,700
Property, Plant and Equipment, Transfers and Changes		$ 6,200
Property, plant and equipment, gross		198,065	$ 197,938
Accumulated depreciation and amortization		(64,803)	(65,472)
Property and equipment, net		133,262	132,466
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		42,361	42,460
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		85,296	78,877
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		23,737	23,738
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		14,608	15,023
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		12,893	13,079
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		7,299	7,734
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross		400	400
Property, plant and equipment, gross		8,939	8,885
Demonstration units
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		984	973
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		45	45
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,903	$ 7,124
Capital Lease Obligations [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization		$ (300)

X

- Definition

The amount of square feet occupied.

+ References

No definition available.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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+ References

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