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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |
Highly liquid investments with an original maturity | 90 days or less |  |
Cash of held in foreign bank accounts | $ 5,100,000 | $ 3,000,000 |
Depreciation expense | 1,700,000 | 1,600,000 | $ 1,400,000
Net foreign exchange losses | 200,000 | 300,000 | 200,000
Advertising expense | 1,300,000 | 1,100,000 | 1,700,000
Impairment charges for long-lived assets | 0 | 0 | 0
Impairment charges for intangible assets | $ 0 | $ 0 | $ 0
Number of common equivalent shares | 459,700 | 425,200 | 156,600
No compensation expense is recognized on forfeited options | $ 0 |  |
Land Improvements [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 20 years |  |
Land Improvements [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 10 years |  |
Building and Improvements [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 45 years |  |
Building and Improvements [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 10 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 10 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 3 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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