CUSTOMER CONCENTRATIONS (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020
Accounts Receivable
Customer Concentrations
Number of customers			4		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			25.00%		24.00%
Major Customer One | Contract Asset
Customer Concentrations
Percentage of major customers or segments			65.00%		51.00%
Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			18.00%		21.00%
Major Customer Two | Contract Asset
Customer Concentrations
Percentage of major customers or segments			22.00%		31.00%
Major Customer Three | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			10.00%		12.00%
Major Customer Four | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			10.00%
Power Services | Revenue
Customer Concentrations
Percentage of major customers or segments	79.00%	44.00%	80.00%	43.00%
Number of customers	1	1	2	2
Power Services | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	70.00%	23.00%	66.00%	12.00%
Power Services | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments			10.00%	10.00%
Industry services | Revenue
Customer Concentrations
Percentage of major customers or segments	19.00%	53.00%	18.00%	54.00%
Number of customers		1
Industry services | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments		11.00%