Acquisitions - Narrative (Details)	12 Months Ended	0 Months Ended		3 Months Ended	12 Months Ended
	Jan. 27, 2013 USD ($)	Mar. 20, 2012 Gennum USD ($)	Mar. 20, 2012 Gennum CAD	Jan. 27, 2013 Gennum USD ($)	Jan. 27, 2013 Gennum USD ($)	Oct. 28, 2012 Gennum USD ($)	May 27, 2012 Gennum USD ($)	Mar. 07, 2012 Cycleo 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
Secured term loans, maturity term		5 years	5 years
Original issue discount on debt		3,000,000
Post-acquisition compensation expense					9,600,000
Goodwill decrease, purchase accounting adjustments				900,000
Purchase price allocation, goodwill		261,891,000		261,900,000	261,900,000	262,800,000
Transaction and integration expenses					11,400,000
Severance costs associated with Gennum acquisition	13,400,000
Net sales attributable to acquiree					129,600,000
Net loss attributable to acquiree					(36,500,000)
Settled pre-acquisition contingencies related to legal matters							4,200,000
Cash paid for acquisition								5,000,000
Deferred compensation potential cash payment								$ 16,000,000