The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References+ Details

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details

Balance Sheet Components (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
Balance Sheet Components (Narrative) (Details) (USD $)	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Balance Sheet Components [Line Items]
Depreciation	$ 2,900,000	$ 2,600,000	$ 5,500,000	$ 4,900,000
Amortization expense	1,000,000	1,200,000	2,000,000	2,500,000
Goodwill, Acquired During Period			3,041,000
Minimum [Member]
Balance Sheet Components [Line Items]
Short term investments maturity (in months)			3 months
Maximum [Member]
Balance Sheet Components [Line Items]
Short term investments maturity (in months)			12 months
Commercial [Member]
Balance Sheet Components [Line Items]
Goodwill, Acquired During Period			3,041,000
Existing Technology [Member]
Balance Sheet Components [Line Items]
Acquired Finite-lived Intangible Asset, Amount	$ 4,200,000		$ 4,200,000