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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 Y Store | Jan. 31, 2013 | Jan. 31, 2012 | Nov. 27, 2012 Nonqualified Deferred Compensation Plan | Jan. 31, 2014 Minimum | Jan. 31, 2014 Maximum
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Number of lease commitment not opened | 27 |  |  |  |  |
Commitments for un-fulfilled purchase orders | $ 367,003,000 |  |  |  |  |
Commitments with construction contractors | 29,350,000 |  |  |  |  |
U.S. based employees age limit to participate in 401(k) Saving Plan | 18 |  |  |  |  |
Percentage of compensation deferred by employees under Saving Plan |  |  |  |  | 1.00% | 25.00%
Employer matching contribution per employee | 0.25 |  |  | 0.25 |  |
Percentage of employee contribution for first threshold limit of employer contribution | 6.00% |  |  | 6.00% |  |
Employees contribution percentage vested | 100.00% |  |  | 100.00% |  |
Percentage of employers contribution per year vested | 20.00% |  |  | 100.00% |  |
Company's contribution to Savings Plan | 1,770,000 | 1,483,000 | 1,365,000 | 1,666,000 |  |
Aggregate market value of investments |  |  |  | $ 1,666,000 |  |

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