Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015	Jan. 31, 2017	Aug. 31, 2015	Oct. 31, 2014	Jan. 31, 2014
Number of shares of common stock issued	1,100
Program Amount authorized to repurchase				$ 100,000	$ 100,000	$ 100,000	$ 100,000
Components of accumulated other comprehensive income (loss), net of taxes
Balance	$ 761,114	$ 758,056	$ 738,562
Other comprehensive income (loss)	999	(425)	602
Balance	$ 826,958	$ 761,114	$ 758,056
Common Stock
Repurchase of common stock (in shares)	(893)	(1,650)	(1,678)
Components of accumulated other comprehensive income (loss), net of taxes
Balance	$ 4	$ 4	$ 4
Balance	4	4	4
Unrealized Gain on Cash Flow Hedge
Components of accumulated other comprehensive income (loss), net of taxes
Balance	60	215	333
Other comprehensive income ( loss) before reclassifications	953	(473)	(520)
Amounts reclassified from accumulated other comprehensive income (loss)	162	318	402
Other comprehensive income (loss)	1,115	(155)	(118)
Balance	1,175	60	215
Net Unrealized Losses on Available-For-Sale Securities
Components of accumulated other comprehensive income (loss), net of taxes
Balance	(567)	(297)	(1,017)
Other comprehensive income ( loss) before reclassifications	(116)	(276)	720
Amounts reclassified from accumulated other comprehensive income (loss)		6
Other comprehensive income (loss)	(116)	(270)	720
Balance	(683)	(567)	(297)
Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive income (loss), net of taxes
Balance	(507)	(82)	(684)
Other comprehensive income ( loss) before reclassifications	837	(749)	200
Amounts reclassified from accumulated other comprehensive income (loss)	162	324	402
Other comprehensive income (loss)	999	(425)	602
Balance	$ 492	$ (507)	$ (82)
Micrium
Number of shares of common stock issued	100