Note 9. Software, Equipment and Leasehold Improvements (Detail) - Software, Equipment and Leasehold Improvements (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 02, 2013	Jan. 28, 2012
Property, plant and equipment balances	$ 53,339	$ 51,417
Less: Accumulated depreciation and amortization	(36,233)	(31,808)
Total software, equipment and leasehold improvements, net	17,106	19,609
Software [Member]
Estimated Useful Lives (years)	2 years
Property, plant and equipment balances	24,216	25,267
Equipment [Member] | Minimum [Member]
Estimated Useful Lives (years)	2 years
Equipment [Member] | Maximum [Member]
Estimated Useful Lives (years)	5 years
Equipment [Member]
Property, plant and equipment balances	17,688	14,486
Office Equipment [Member]
Estimated Useful Lives (years)	2 years
Property, plant and equipment balances	8,338	8,144
Leasehold Improvements [Member] | Minimum [Member]
Estimated Useful Lives (years)	1 year
Leasehold Improvements [Member] | Maximum [Member]
Estimated Useful Lives (years)	6 years
Leasehold Improvements [Member]
Property, plant and equipment balances	$ 3,097	$ 3,520
Minimum [Member]
Estimated Useful Lives (years)	1 year
Maximum [Member]
Estimated Useful Lives (years)	5 years