Acquisitions (Narrative) (Details)	3 Months Ended	6 Months Ended					3 Months Ended	6 Months Ended			6 Months Ended
	Jul. 29, 2012 Gennum [Member] USD ($)	Jul. 29, 2012 Gennum [Member] USD ($)	May 27, 2012 Gennum [Member] USD ($)	Apr. 29, 2012 Gennum [Member] USD ($)	Mar. 20, 2012 Gennum [Member] USD ($)	Mar. 20, 2012 Gennum [Member] CAD	Jul. 29, 2012 Cycleo [Member] USD ($)	Jul. 29, 2012 Cycleo [Member] USD ($)	Apr. 29, 2012 Cycleo [Member] USD ($)	Mar. 07, 2012 Cycleo [Member] USD ($)	Jul. 29, 2012 Product Development and Engineering [Member] Cycleo [Member] USD ($)	Jul. 29, 2012 Selling, General and Administrative [Member] 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
Goodwill decrease, purchase accounting adjustments	5,400,000						3,300,000
Purchase price allocation, goodwill	258,400,000	258,400,000		263,800,000	258,386,000		2,000,000	2,000,000	5,300,000
Acquisition related costs expensed	1,800,000	20,400,000
Net sales	35,300,000	47,300,000
Net loss	(22,700,000)	(51,300,000)
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
Deferred compensation expense								$ 977,000			$ 635,000	$ 342,000