Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended									1 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013 Unrealized Gain (Loss) on Cash Flow Hedge	Dec. 29, 2012 Unrealized Gain (Loss) on Cash Flow Hedge	Dec. 31, 2011 Unrealized Gain (Loss) on Cash Flow Hedge	Dec. 28, 2013 Net Unrealized Losses on Available-For-Sale Securities	Dec. 29, 2012 Net Unrealized Losses on Available-For-Sale Securities	Dec. 31, 2011 Net Unrealized Losses on Available-For-Sale Securities	Jan. 31, 2014 Maximum	Jan. 31, 2013 Maximum	Apr. 30, 2012 Maximum	Oct. 31, 2011 Maximum	Jul. 31, 2010 Maximum
Stockholders' Equity
Number of shares of common stock issued	1,600,000
Number of shares issued in connection with the acquisition of Energy Micro	500,000
Stockholders' Equity
Program Amount authorized to repurchase										$ 100,000	$ 50,000	$ 100,000	$ 50,000	$ 150,000
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	(946)	(2,467)	(3,648)	(428)	(1,299)	(2,477)	(518)	(1,168)	(1,171)
Other comprehensive income (loss) before reclassifications	49	29	(273)	397	(621)	(276)	(348)	650	3
Amounts reclassified from accumulated other comprehensive loss	213	1,492	1,454	364	1,492	1,454	(151)
Other comprehensive income	262	1,521	1,181	761	871	1,178	(499)	650	3
Balance at end of the period	(684)	(946)	(2,467)	333	(428)	(1,299)	(1,017)	(518)	(1,168)
Repurchase of common stock (in shares)	700,000	1,700,000	3,200,000
Repurchase of common stock	$ 26,022	$ 62,019	$ 110,063