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CUSTOMER CONCENTRATIONS (Details) - customer	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Accounts Receivable
Customer Concentrations
Number of customers	3	3
Contract Asset
Customer Concentrations
Number of customers	2	2
Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	26.00%	24.00%
Major Customer One | Contract Asset
Customer Concentrations
Percentage of major customers or segments	64.00%	51.00%
Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	11.00%	21.00%
Major Customer Two | Contract Asset
Customer Concentrations
Percentage of major customers or segments	12.00%	31.00%
Major Customer Three | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	11.00%	12.00%
Power Services | Revenue
Customer Concentrations
Percentage of major customers or segments	81.00%	57.00%	76.00%
Number of customers	1	2	4
Power Services | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	67.00%	22.00%	16.00%
Power Services | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments		15.00%	14.00%
Power Services | Major Customer Three | Revenue
Customer Concentrations
Percentage of major customers or segments			12.00%
Power Services | Major Customer Four | Revenue
Customer Concentrations
Percentage of major customers or segments			10.00%
Industry services | Revenue
Customer Concentrations
Percentage of major customers or segments	17.00%	40.00%	21.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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