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Discontinued Operations - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013
Deferred Financing Costs [Line Items] |  |
Proceeds from sale |  | $ 16,800,000
Proceeds from sale held in escrow recognized | 1,800,000 |
Impairment charge on assets related to discontinued operations |  | 779,000
Grass Technologies Product Group [Member] |  |
Deferred Financing Costs [Line Items] |  |
Proceeds from sale |  | 18,600,000
Proceeds from sale recognized |  | $ 16,800,000

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