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ACCOUNTS RECEIVABLE (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2010
Accounts, Notes, Loans and Financing Receivable |  |  |
Contract payment amounts retained by project owners | $ 44,626,000 | $ 26,100,000 |
Provision for accounts receivable loss | 0 | 0 |
Allowance for doubtful accounts |  | $ 5,500,000 |
Accounts receivable from the owner of a partially completed construction project |  |  | $ 5,500,000
Cash received | $ 1,600,000 |  |
Minimum |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |
Length of retention period of amount given to project owners | 6 months |  |
Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |
Length of retention period of amount given to project owners | 9 months |  |

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