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Balance Sheet Components (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Balance Sheet Components [Line Items]
Depreciation	$ 2.6	$ 2.3
Amortization expense	$ 1.0	$ 1.4
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

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.

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