Organization and Summary of Significant Accounting Policies (Details Textual) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013 segments	Jul. 01, 2012	Dec. 29, 2013 segments	Dec. 30, 2012	Jan. 01, 2012
Operating Cycle			P52W	P52W	P52W
Number of reportable segments			1
Number of operating segments	1		2
Number of future reportable segments	1
Maximum investment portfolio credit exposure per issuer at time of purchase			5.00%
Maximum investment portfolio credit exposure per industry sector at time of purchase			25.00%
Cash Equivalents and Short-term Investments, Maturity Period, Maximum1			90 days
Impairment of IPR&D		$ 21,400,000
Impairments			25,214,000	21,438,000
Notional amount of outstanding forward contracts			54,700,000	51,200,000
Non-designated forward contract related loss			3,500,000
Instrument warranty period			1 year
Expected dividend yield			0.00%
Advertising expense			14,500,000	10,500,000	9,400,000
Minimum [Member]
Useful life			3 years
Consumable warranty period			6 months
Product or service delivery period			3 months
Maximum [Member]
Useful life			7 years
Consumable warranty period			12 months
Product or service delivery period			6 months
Cost of Sales [Member]
Impairments			25,200,000
Intangible asset impairments			$ 22,900,000