CUSTOMER CONCENTRATIONS (Details) - customer	3 Months Ended		12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Jan. 31, 2021
Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	23.00%
Customer Concentration Risk | Accounts Receivable
Customer Concentrations
Number of customers	2		3
Customer Concentration Risk | Contract Asset
Customer Concentrations
Number of customers	1		2
Customer Concentration Risk | Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			26.00%
Customer Concentration Risk | Major Customer One | Contract Asset
Customer Concentrations
Percentage of major customers or segments	65.00%		64.00%
Customer Concentration Risk | Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			11.00%
Customer Concentration Risk | Major Customer Two | Contract Asset
Customer Concentrations
Percentage of major customers or segments			12.00%
Customer Concentration Risk | Major Customer Three | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			11.00%
Power Services | Product Concentration Risk | Revenue
Customer Concentrations
Percentage of major customers or segments	77.00%	81.00%
Power Services | Customer Concentration Risk | Revenue
Customer Concentrations
Number of customers	1	2
Power Services | Customer Concentration Risk | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	68.00%	61.00%
Power Services | Customer Concentration Risk | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments		17.00%
Industry services | Product Concentration Risk | Revenue
Customer Concentrations
Percentage of major customers or segments	21.00%	16.00%