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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $) | Jan. 31, 2014 | Jan. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 8,390,000 | $ 13,230,000
Less - accumulated depreciation | 4,207,000 | 3,762,000
Property, plant and equipment, net | 4,183,000 | 9,468,000
Land and Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 473,000 | 471,000
Building and Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 2,779,000 | 2,587,000
Furniture, Machinery and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 3,560,000 | 3,060,000
Trucks and Other Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 1,578,000 | 1,803,000
Construction Project Costs of Variable Interest Entities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross |  | $ 5,309,000

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