Acquisitions - Narrative (Details)	6 Months Ended
	Jul. 29, 2012 Gennum [Member] USD ($)	Mar. 20, 2012 Gennum [Member] USD ($)	Mar. 20, 2012 Gennum [Member] CAD	Jul. 28, 2013 Cycleo [Member] USD ($)	Mar. 07, 2012 Cycleo [Member] USD ($)
Percentage of outstanding shares acquired		100.00%	100.00%
Price paid per share			13.55
Total acquisition consideration		$ 506,546,000
Long-term debt		347,000,000
Original issue discount on debt		3,000,000
Post-acquisition compensation expense	9,600,000
Cash paid for acquisition					5,000,000
Deferred compensation potential cash payment					16,000,000
Potential earn-out payment for Year 1				1,800,000
Potential earn-out payment for Year 2				$ 3,000,000