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Major Customers - Additional Information (Detail) | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
Customer One |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of net sales from major customer | 21.30% | 18.70% | 17.30%
Customer Two |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of net sales from major customer | 9.50% | 12.30% | 12.40%

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration