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Share-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Aug. 03, 2013 | May 04, 2013 | Jul. 28, 2012 | Apr. 28, 2012 | Aug. 03, 2013 | Jan. 31, 2013 | Aug. 03, 2013 Employee Stock Purchase Plan [Member] | Jul. 28, 2012 Employee Stock Purchase Plan [Member] | Aug. 03, 2013 Employee Stock Purchase Plan [Member] | Jul. 28, 2012 Employee Stock Purchase Plan [Member] | Aug. 03, 2013 Officer [Member] | Aug. 03, 2013 Officer [Member] Third Anniversary [Member] | Aug. 03, 2013 Non-Employee Director [Member] | Aug. 03, 2013 Non-Employee Director [Member] | Aug. 03, 2013 2014 Restricted Stock Units (RSUs) [Member] | Aug. 03, 2013 2014 Restricted Stock Units (RSUs) [Member] | Aug. 03, 2013 2014 Restricted Stock Units (RSUs) [Member] First Anniversary [Member] | Aug. 03, 2013 2014 Restricted Stock Units (RSUs) [Member] Second Anniversary [Member] | Aug. 03, 2013 Equity Incentive Plan [Member] | Aug. 03, 2013 Equity Incentive Plan [Member] Non-Employee Director [Member] | Aug. 03, 2013 Restricted Stock [Member] Non-Employee Director [Member] | Aug. 03, 2013 Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 10 years | 12 months |
Aggregate shares authorized for awards under the plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
Shares available for grant under the Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 356,300 |  |  |
Restricted stock unit vested percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  | 50.00% | 50.00% |  |  |  |
Disposal restricted percentage of RSU |  |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Cumulative budgeted net sales target measurement period |  |  |  |  |  |  |  |  |  |  | 2014 through 2016 |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit vested percentage for annual operating income |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Stock options grant to each non-employee director |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,544 |  |  |  | 5,000 |  |  |
Number of shares granted to non-employee directors |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |  |  |
Non-employee director is entitled to an annual cash retainer |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |  |  |
Non-employee director is entitled to an annual cash retainer additional |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |
Non-employee director received restricted stock award value |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |  |
Options granted weighted average fair value per share | $ 2.79 | $ 2.79 | $ 2.01 | $ 2.09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,596
Unrecognized compensation expense related to unvested options, recognize date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | through April 2016 |  |  |  |  |  | through March 2017
Unrecognized compensation expense related to unvested options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 531,785 | $ 531,785 |  |  |  |  |  |
Employee purchase plan discount rate |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reservation of shares under stock purchase plan |  |  |  |  |  |  |  |  | 247,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares purchase under employee stock purchase plan |  |  |  |  |  |  | 1,054 | 1,550 | 2,266 | 2,547 |  |  |  |  |  |  |  |  |  |  |  |
Available shares under Stock Purchase Plan | 877,183 |  |  |  | 877,183 | 916,612 | 61,965 |  | 61,965 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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