Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			1 Months Ended		1 Months Ended			3 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended		3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended		3 Months Ended		1 Months Ended		1 Months Ended	9 Months Ended				1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012 Cost of goods sold	Oct. 29, 2011 Cost of goods sold	Oct. 27, 2012 Cost of goods sold	Oct. 29, 2011 Cost of goods sold	Oct. 27, 2012 Selling, General and Administrative Expense	Oct. 29, 2011 Selling, General and Administrative Expense	Oct. 27, 2012 Selling, General and Administrative Expense	Oct. 29, 2011 Selling, General and Administrative Expense	Jun. 14, 2006 1996 Equity Incentive Plan	Jun. 14, 2006 1996 Equity Incentive Plan Maximum	Jun. 05, 2012 2006 Equity Incentive Plan	Jun. 05, 2012 2006 Equity Incentive Plan Maximum	Mar. 31, 2012 2006 Equity Incentive Plan Chief Executive Officer	Mar. 31, 2011 2006 Equity Incentive Plan Chief Executive Officer	Oct. 27, 2012 2006 Equity Incentive Plan Chief Executive Officer	Oct. 27, 2012 2006 Equity Incentive Plan Restricted Stock	Oct. 29, 2011 2006 Equity Incentive Plan Restricted Stock	Feb. 28, 2011 2006 Equity Incentive Plan Restricted Stock Chief Executive Officer	Apr. 30, 2011 2006 Equity Incentive Plan Restricted Stock Chief Executive Officer	Mar. 31, 2012 2006 Equity Incentive Plan Restricted Stock Director	Jun. 30, 2011 2006 Equity Incentive Plan Restricted Stock Director	Oct. 27, 2012 2006 Equity Incentive Plan Restricted Stock Director	Oct. 29, 2011 2006 Equity Incentive Plan Restricted Stock Director	Oct. 27, 2012 2006 Equity Incentive Plan Restricted Stock Director	Oct. 29, 2011 2006 Equity Incentive Plan Restricted Stock Director	Apr. 30, 2012 2006 Equity Incentive Plan Restricted Stock Independent consultant	Oct. 27, 2012 2006 Equity Incentive Plan Restricted Stock Independent consultant	Oct. 27, 2012 2006 Equity Incentive Plan Restricted Stock Independent consultant	Mar. 31, 2009 2006 Equity Incentive Plan Performance Awards	Mar. 31, 2009 2006 Equity Incentive Plan Performance Awards Maximum	Oct. 27, 2012 2006 Equity Incentive Plan Employee Stock Option	Oct. 29, 2011 2006 Equity Incentive Plan Employee Stock Option	Mar. 31, 2011 2006 Equity Incentive Plan Employee Stock Option Employees	Jun. 05, 2012 1996 NEDSOP	Jun. 05, 2012 1996 NEDSOP Maximum	Oct. 27, 2012 2012 Equity Incentive Plan	Oct. 27, 2012 2012 Equity Incentive Plan Maximum	Oct. 27, 2012 2012 Equity Incentive Plan Minimum	Oct. 27, 2012 2012 Equity Incentive Plan Persons possessing 10% or more of voting power Minimum	Jun. 30, 2012 2012 Equity Incentive Plan Restricted Stock Director	Jun. 30, 1996 ESPP	Oct. 27, 2012 ESPP	Oct. 29, 2011 ESPP	Oct. 27, 2012 ESPP	Oct. 29, 2011 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant													732,456		942,602																							34,976		3,976,103						692,372		692,372
Aggregate number of shares authorized for grant													18,300,000		3,082,456																							720,000							1,350,000
Options, expiration period														10 years		10 years																							10 years		8 years
Exercise price percentage on fair market value of common stock on date of grant																																										100.00%	110.00%
Number of additional shares authorized for grant																																								3,100,000
Stock Purchase Plan discount																																													15.00%
Share based compensation expense	$ 1,084,000	$ 671,000	$ 3,152,000	$ 3,493,000	$ 127,000	$ 118,000	$ 460,000	$ 336,000	$ 1,000,000	$ 600,000	$ 2,700,000	$ 3,200,000											$ 98,000			$ 50,000	$ 45,000	$ 149,000	$ 144,000		$ 8,000	$ 25,000														$ 66,000	$ 45,000	$ 150,000	$ 123,000
Award grants in period																						17,568		515	25,387					2,525				100,000										21,008
Vesting period																												1 year									4 years
Number of options granted			1,708,354														100,000	500,000																			415,000
Market value common stock as of grant date																																	$ 9.56
Unrecognized expense, weighted average recognition period	2 years 8 months 5 days	2 years 9 months 15 days																	3 years 5 months 1 day	7 months 10 days	5 months 23 days												3 years		2 years 5 months 1 day	3 years 5 months 1 day
Total fair value of shares vested	900,000	700,000	2,400,000	3,000,000
Unrecognized expense	$ 7,000,000	$ 5,700,000	$ 7,000,000	$ 5,700,000															$ 200,000	$ 117,000	$ 105,000														$ 300,000	$ 700,000
Weighted average fair value, grant date																			$ 3.44