Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 29, 2012
Credit Facilities (Textual) [Abstract]
Credit Facility Collateral	Borrowings are not collateralized
Maximum borrowing capacity under bank line of credit facility	$ 10.0
Bank line of credit facility, maturity date	Aug. 25, 2012
Amounts outstanding under bank line of credit facility	0
Borrowings under bank line of credit facility	$ 0
Line of credit facility financial covenant terms	3.97 to 1
Interest rate	3.25%
Unrestricted cash, cash equivalents and short-term investments to current liabilities ratio	maintain unrestricted cash, accounts receivable and short-term investments to current liabilities of at least 1.75 to 1.00
Annualized rate of LIBOR	0.25%
Maximum [Member]
Credit Facilities (Additional Textual) [Abstract]
Percentage added to LIBOR to facilitate line of credit	2.00%
Minimum [Member]
Credit Facilities (Additional Textual) [Abstract]
Percentage added to LIBOR to facilitate line of credit	1.75%