Note 3. Fair Values of Assets and Liabilities (Detail) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Feb. 02, 2012	Jan. 28, 2012
Cash equivalents and short-term investments	$ 54,019	$ 125,032
Restricted cash	1,769	1,769
Derivative instruments	438	(121)
Total assets/liabilities measured at fair value	56,226	126,680
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	31,179	92,021
Corporate Bond Securities [Member]
Cash equivalents and short-term investments	31,179	92,021
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	21,032	20,876
Money Market Funds [Member]
Cash equivalents and short-term investments	21,032	20,876
Municipal Bonds and Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	529	1,687
Municipal Bonds and Notes [Member]
Cash equivalents and short-term investments	529	1,687
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	1,279
Fixed Income Funds [Member]
Cash equivalents and short-term investments	1,279
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments		1,946
Commercial Paper [Member]
Cash equivalents and short-term investments		1,946
US Agency Discount Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments		8,502
US Agency Discount Notes [Member]
Cash equivalents and short-term investments		8,502
Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	54,019	125,032
Restricted cash	1,769	1,769
Total assets/liabilities measured at fair value	55,788	126,801
Fair Value, Inputs, Level 2 [Member]
Derivative instruments	438	(121)
Total assets/liabilities measured at fair value	$ 438	$ (121)