Acquisitions (Details) (USD $)		3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
	Feb. 02, 2013	Feb. 02, 2013 Lyric Semiconductor, Inc [Member]	Oct. 29, 2011 Lyric Semiconductor, Inc [Member]	Jun. 09, 2011 Lyric Semiconductor, Inc [Member]	Feb. 02, 2013 Multigig, Inc [Member]	Nov. 03, 2012 Multigig, Inc [Member]	Nov. 03, 2012 Multigig, Inc [Member]
Business Acquisition [Line Items]
Fair value of the consideration transferred totaled				$ 27,800,000	$ 26,800,000
Initial cash payments				14,000,000	24,200,000
Indemnification holdback					2,600,000
Indemnification holdback months to be paid					15 months
Business Acquisition Indemnification Holdback Adjustment					100,000
In-process research and development		12,200,000			15,600,000
Developed technology					1,100,000
Goodwill acquired					7,000,000
Deferred tax assets (liabilities)		(3,300,000)			3,100,000
Obligation payment period		20 years			5 years
Obligated to pay royalties on revenue recognized from the sale of products and licenses		25,000,000			1,000,000
Acquisition related costs			200,000				500,000
Contingent consideration		8,300,000		13,800,000
Goodwill		18,900,000
Current portion of contingent consideration liability		5,600,000
Noncurrent portion of contingent consideration liability		2,700,000
Payments for contingent consideration		6,000,000
Goodwill deductible for tax purposes	0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets						400,000
Royalty payments		$ 0			$ 0
Period of cash payments related to contingent consideration		June 2011 through June 2016