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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate for income from continuing operation | 36.00% | 34.50% | 32.70% |
Foreign tax credit carryforwards | $ 508,000 | $ 426,000 |  |
Tax credit carryforward expiration period | Between fiscal years ended 2024 to 2027. |  |  |
Valuation allowance | $ 679,000 | 583,000 |  |
Increase (decrease) in valuation allowance | 100,000 | 300,000 |  |
Recognized tax benefits excluding interest and penalties | 708,000 | 591,000 | $ 707,000 | $ 715,000
Impact on effective tax rate, decrease | 500,000 |  |  |
Recognized (benefit) expense related to interest and penalties | 52,000 | (87,000) | $ 43,000 |
Accrued potential interest and penalties | 400,000 | $ 400,000 |  |
Undistributed earnings of foreign subsidiaries | $ 4,700,000 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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