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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
Number of Ethanol Entities Under Ownership Interest | 4 |  |
Number of State Under Which Real Estate Portfolio Manage | 11 |  |
Number of Reportable Segments | 2 |  |
Maximum Maturity Period of Short Term Investments | 3 months |  |
Concentration Risk Number of Customer | 4 | 3 | 2
Concentration Risk, Percentage | 81.00% | 78.00% | 45.00%
Inventory Write-down | $ 466,000 | $ 153,000 |
Property, Plant and Equipment, Depreciation Methods | Depreciation is computed using the straight-line method |  |
Impairment of Real Estate | 562,000 | 1,227,000 | 1,021,000
Estimated Cash Flow Percentage | 25.00% |  |
EstimatedFutureCashFlowsTerms | six |  |
Depreciation | 16,081,000 | 11,721,000 | 15,800,000
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting | 20.00% |  |
Interest Costs Capitalized | 0 | 0 | 0
Interest Paid | 4,449,000 | 3,174,000 | 4,701,000
Derivative Settlement on Interest Rate Swap | 1,816,000 | 2,436,000 | 2,477,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 0 | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | 1,800,000 | 3,200,000 | 700,000
Tax Benefit from Stock Options Exercised | 200,000 | 1,200,000 | 300,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | 0 |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 15 |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 40 |  |
Fixtures And Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 3 |  |
Fixtures And Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 20 |  |
Customer Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 80.00% | 58.00% |
Cost of Sales [Member] |  |  |
Impairment of Real Estate | 419,000 | 1,227,000 | 89,000
Discontinued Operation [Member] |  |  |
Impairment of Real Estate | $ 143,000 |  | $ 932,000
Minimum [Member] |  |  |
Extended Period of Warranty | 12 months |  |
Maximum [Member] |  |  |
Extended Period of Warranty | 60 months |  |

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