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ACCOUNTS RECEIVABLE - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May. 31, 2015 | Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2015 | Oct. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Contract payment amounts retained by project owners |  | $ 35,000,000 |  | $ 35,000,000 |  | $ 26,100,000 |
Allowance for doubtful accounts |  |  |  |  |  | $ 5,500,000 |
Cash received | $ 1,600,000 |  |  |  |  |  |
Provision for accounts receivable loss |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
Minimum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Length of retention period of amount given to project owners |  |  |  | 6 months |  |  |
Maximum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Length of retention period of amount given to project owners |  |  |  | 9 months |  |  |
Altra Nebraska, LLC |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Accounts receivable from the owner of a partially completed construction project |  |  |  |  |  |  | $ 5,500,000

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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