Business Combinations (Details) (USD $)	9 Months Ended	12 Months Ended
	Oct. 30, 2011	Jan. 29, 2012	Jan. 30, 2011
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract]
Retention Bonus	$ 68,000,000
No. of years for retention bonus payout	4
Deferred Tax Assets, Net, Current		49,931,000	9,456,000
Goodwill		641,030,000	369,844,000
Accrued liabilities		(38,735,000)
Deferred Tax Liabilities, Noncurrent		133,288,000	46,129,000
Net assets acquired	352,200,000
Pro forma net revenue		4,018,330,000	3,591,409,000
Pro forma net income		556,516,000	179,566,000
Pro forma net incomp per share (basic)		$ 0.92	$ 0.31
Pro forma net income per share (diluted)		$ 0.90	$ 0.31
Goodwill, Translation and Purchase Accounting Adjustments		47,500,000
PPA adjustment for 328 study		54,500,000
Net Deferred Tax Asset for certain tax attributes		7,000,000
Icera Business Acquisition [Member]
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract]
Cash acquired		3,315,000
Accounts receivable		13,740,000
Inventory		13,510,000
Prepaid and other current assets		1,972,000
Deferred Tax Assets, Net, Current		13,036,000
Property, plant and equipment		3,649,000
Goodwill		271,186,000
Acquired intangible asset		97,515,000
Other assets		591,000
Total assets acquired		418,514,000
Accounts payable		(6,026,000)
Notes payable		(10,319,000)
Income Taxes payable		(4,558,000)
Deferred Tax Liabilities, Noncurrent		(6,677,000)
Net assets acquired		$ 352,199,000