Fair Value Measurements (Tables)

9 Months Ended

Oct. 29, 2011

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
Current Assets	Balance as of October 29, 2011	Quoted Prices in Active Markets for Identical Assets (Level 1)	Significant Other Observable Inputs          (Level 2)	Significant Unobservable Inputs               (Level 3)
Cash equivalents:
Money market accounts	$         1,312	$              1,312	$                   –	$               –
Marketable securities:
Municipal securities	68,405	–	68,405	–
U.S. government securities	58,575	35,454	23,121	–
Corporate bonds	61,296	–	61,296	–
Asset-backed securities	–	–	–	–
Commercial paper	–	–	–	–
Certificates of deposit	2,052	–	2,052	–
Non Current Assets
Deferred compensation plan	4,042	4,042	–	–
Total	$     195,682	$         40,808	$        154,874	$              –
Current Assets	Balance as of January 29, 2011
Cash equivalents:
Money market accounts	$         5,397	$                5,397	$                   –	$               –
Marketable securities:
Variable rate demand notes	319,220	–	319,220	–
Municipal securities	151,159	–	151,159	–
U.S. government securities	58,554	58,554	–	–
Corporate bonds	2,055	–	2,055	–
Asset-backed securities	3,031	–	3,031	–
Non Current Assets
Deferred compensation plan	4,143	4,143	–	–
Total	$     543,559	$              68,094	$        475,465	$               –
Current Assets	Balance as of October 30, 2010
Cash equivalents:
Money market accounts	$         629	$              629	$                   –	$               –
Marketable securities:
Variable rate demand notes	273,187	–	273,187	–
Municipal securities	143,950	–	143,950	–
U.S. government securities	58,949	58,949	–	–
Corporate bonds	2,170	–	2,170	–
Asset-backed securities	5,366	–	5,366	–
Non Current Assets
Deferred compensation plan	3,996	3,996	–	–
Total	$     488,247	$     63,574	$       424,673	$               –