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CUSTOMER CONCENTRATIONS (Details) $ in Millions | 12 Months Ended
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Jan. 31, 2020 USD ($) Owner customer | Jan. 31, 2019 USD ($) Owner customer | Jan. 31, 2018 customer
Customer Concentrations |  |  |
Amounts retained by project owners | $ 20.0 | $ 15.3 |
Percentage of amounts retained by project owners | 82.00% | 93.00% |
Accounts Receivable |  |  |
Customer Concentrations |  |  |
Number of customers | customer | 3 | 2 |
Number of project owners | Owner | 3 | 5 |
Major Customer One |  |  |
Customer Concentrations |  |  |
Amounts retained by project owners | $ 6.5 | $ 5.8 |
Major Customer One | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 24.00% | 25.00% |
Major Customer Two |  |  |
Customer Concentrations |  |  |
Amounts retained by project owners | $ 5.9 | $ 4.5 |
Major Customer Two | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 21.00% | 15.00% |
Major Customer Three |  |  |
Customer Concentrations |  |  |
Amounts retained by project owners | $ 4.0 | $ 1.6 |
Major Customer Three | Accounts Receivable |  |  |
Customer Concentrations |  |  |
Percentage of consolidated accounts receivable accounted by major customer | 12.00% |  |
Major Customer Four |  |  |
Customer Concentrations |  |  |
Amounts retained by project owners |  | 1.3 |
Major Customer Five |  |  |
Customer Concentrations |  |  |
Amounts retained by project owners |  | $ 1.0 |
Power Services | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 57.00% | 76.00% | 91.00%
Number of customers | customer | 2 | 4 | 4
Power Services | Major Customer One | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 22.00% | 16.00% | 29.00%
Power Services | Major Customer Two | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments | 15.00% | 14.00% | 26.00%
Power Services | Major Customer Three | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments |  | 12.00% | 15.00%
Power Services | Major Customer Four | Revenue |  |  |
Customer Concentrations |  |  |
Percentage of major customers or segments |  | 10.00% | 14.00%

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