Supplementary Financial Data (Unaudited) (Details) - Quarterly Financial Information (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Aug. 01, 2013
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Quarterly Financial Information [Abstract]                        
Net sales (1)   $ 309,509 [1] $ 315,930 [1] $ 314,666 [1] $ 311,750 [1] $ 313,670 [1] $ 273,378 [1] $ 195,070 [1] $ 189,572 [1] $ 1,251,855 $ 971,690 $ 915,932
Cost of sales   210,711 215,102 221,844 221,918 220,422 217,209 137,714 143,717 869,575 719,062 632,417
Gross profit   98,798 100,828 92,822 89,832 93,248 56,169 57,356 45,855 382,280 252,628 283,515
Research and development (1)   44,697 [1] 43,241 [1] 39,702 [1] 43,562 [1] 42,102 [1] 38,341 [1] 23,548 [1] 22,777 [1] 171,203 126,768 107,850
Sales, general and administrative (1)   72,177 [1] 60,457 [1] 61,081 [1] 55,631 [1] 60,824 [1] 54,544 [1] 34,414 [1] 28,483 [1] 249,346 178,265 135,607
Restructuring charges (credits)           (247) 6,264       6,017 5,650
Operating income (loss)   (18,076) (2,870) (7,961) (9,361) (9,431) (42,980) (606) (5,405) (38,269) (58,422) 62,842
Interest income and other, net (2)   360 [2] 453 [2] 5,941 [2] (4,600) [2] (3,252) [2] 3,578 [2] 3,118 [2] 962 [2] 2,154 4,406 4,688
Interest expense   (5,982) (5,988) (6,139) (6,087) (7,459) (7,351) (7,378) (7,604) (24,196) (29,792) (30,147)
Gain (loss) on acquisition of Microcontroller and Analog business (3) 7,950    [3]    [3]    [3]    [3] (255) [3] 8,205 [3]    [3]    [3]   7,950  
Loss before income taxes   (23,698) (8,405) (8,159) (20,048) (20,397) (38,548) (4,866) (12,047) (60,311) (75,858) 37,383
(Provision) benefit for income taxes   (1,021) (2,441) (3,815) (2,447) (3,301) 1,644 1,635 (2,388) (9,723) (2,410) (12,999)
Net Loss   $ (24,719) $ (10,846) $ (11,974) $ (22,495) $ (23,698) $ (36,904) $ (3,231) $ (14,435) $ (70,034) $ (78,268) $ 24,384
Net loss per share                        
Basic (in Dollars per share)   $ (0.40) $ (0.18) $ (0.20) $ (0.38) $ (0.40) $ (0.63) $ (0.06) $ (0.25) $ (1.15) $ (1.34) $ 0.41
Diluted (in Dollars per share)   $ (0.40) $ (0.18) $ (0.20) $ (0.38) $ (0.40) $ (0.63) $ (0.06) $ (0.25) $ (1.15) $ (1.34) $ 0.41
Shares used in per share calculateion                        
Basic (in Shares)   62,239 61,543 60,799 59,771 58,878 58,785 58,646 58,086 61,088 58,599 59,984
Diluted (in Shares)   62,239 61,543 60,799 59,771 58,878 58,785 58,646 58,086 61,088 58,599 61,021
[1] The increase from the quarter ended September 29, 2013 onwards compared to the previous quarters is due to the MCA business acquisition.
[2] The decrease for the quarter ended December 29, 2013 is due to $5.3M higher realized, unrealized loss on foreign currency transactions in the fourth quarter of fiscal 2013
[3] The gain for the quarter ended September 29, 2013 and December 29, 2013, relates to the gain and related adjustments on acquistion of the MCA business. The accounting guidance requires that the economic gain resulting from the fair value received being greater than the consideration paid to acquire the net assets to be recorded as an one-time gain included in earnings.