Assumptions Used to Estimate Fair Value of Stock Options Granted (Detail)	3 Months Ended				9 Months Ended
	Nov. 01, 2014		Nov. 02, 2013		Nov. 01, 2014		Nov. 02, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected option term	5 years	[1]	5 years	[1]	5 years	[1]	5 years	[1]
Expected volatility factor			55.00%	[2]
Expected volatility factor, minimum	44.40%	[2]			44.40%	[2]	55.00%	[2]
Expected volatility factor, maximum	44.60%	[2]			46.90%	[2]	56.20%	[2]
Risk-free interest rate			1.70%	[3]
Risk-free interest rate, minimum	1.70%	[3]			1.60%	[3]	0.80%	[3]
Risk-free interest rate, maximum	1.80%	[3]			1.80%	[3]	1.70%	[3]
Expected annual dividend yield	0.00%		0.00%		0.00%		0.00%

[1] The Company has limited historical information regarding expected option term. Accordingly, the Company determined the expected option term of the awards using historical data available from comparable public companies and management's expectation of exercise behavior.

[2] Stock volatility for each grant is measured using the weighted average of historical daily price changes of the Company's competitors' common stock over the most recent period equal to the expected option term of the Company's awards.

[3] The risk-free interest rate is determined using the rate on treasury securities with the same term as the expected life of the stock option as of the grant date.