Fair Value Measurements (Tables)

3 Months Ended

Apr. 28, 2012

Fair Value Measurements [Abstract]

Financial Assets Valued On A Recurring Or Non-Recurring Basis, Based On The Priority Of The Inputs To The Valuation Technique

				Fair Value Measurements at Reporting Date Using
					Significant
				Quoted Prices in		Other	Significant
				Active Markets	Observable		Unobservable
		Balance as of		for Identical		Inputs	Inputs
Current Assets		April 28, 2012		Assets (Level 1)	(Level 2)		(Level 3)
Cash equivalents:
Money market account	$	29,430	$	29,430	$	–	$	–
Marketable securities:
Municipal securities		52,425		–		52,425		–
U.S. government securities		17,700		17,700		–		–
U.S. government agencies		31,608		–		31,608		–
Corporate bonds		86,171		–		86,171		–
Commercial paper		1,990		–		1,990		–
Certificates of deposit		3,552		–		3,552		–
Non Current Assets
Deferred compensation plan		4,316		4,316		–		–
Total	$	227,192	$	51,446	$	175,746	$	–
		Balance as of
		January 28,
Current Assets		2012
Cash equivalents:
Money market account	$	3,793	$	3,793	$	–	$	–
Marketable securities:
Municipal securities		61,260		–		61,260		–
U.S. government securities		25,355		25,355		–		–
U.S. government agencies		23,648		–		23,648		–
Corporate bonds		73,107		–		73,107		–
Commercial paper		1,988		–		1,988		–
Certificates of deposit		3,576		–		3,576		–
Non Current Assets
Deferred compensation plan		4,146		4,146		–		–
Total	$	196,873	$	33,294	$	163,579	$	–
		Balance as of
Current Assets		April 30, 2011
Cash equivalents:
Money market account	$	29,466	$	29,466	$	–	$	–
Marketable securities:
Municipal securities		151,681		–		151,681		–
U.S. government securities		67,290		67,290		–		–
U.S. government agencies		51,835		–		51,835		–
Corporate bonds		122,767		–		122,767		–
Asset-backed securities		1,622		–		1,622		–
Commercial paper		45,555		–		45,555		–
Certificates of deposit		2,065		–		2,065		–
Non Current Assets
Deferred compensation plan		4,343		4,343		–		–
Total	$	476,624	$	101,099	$	375,525	$	–