CUSTOMER CONCENTRATIONS (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Customer Concentration Risk | Accounts Receivable
Customer Concentrations
Number of customers			3		3
Customer Concentration Risk | Contract Asset
Customer Concentrations
Number of customers					2
Customer Concentration Risk | Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			17.00%		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			16.00%		11.00%
Customer Concentration Risk | Major Customer Two | Contract Asset
Customer Concentrations
Percentage of major customers or segments			15.00%		12.00%
Customer Concentration Risk | Major Customer Three | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			10.00%		11.00%
Power Services | Product Concentration Risk | Revenue
Customer Concentrations
Percentage of major customers or segments	74.00%	79.00%	76.00%	80.00%
Power Services | Customer Concentration Risk | Revenue
Customer Concentrations
Number of customers	1	1	1	2
Power Services | Customer Concentration Risk | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	59.00%	70.00%	63.00%	66.00%
Power Services | Customer Concentration Risk | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments				10.00%
Industry services | Product Concentration Risk | Revenue
Customer Concentrations
Percentage of major customers or segments	23.00%	19.00%	22.00%	18.00%
Industry services | Customer Concentration Risk | Revenue
Customer Concentrations
Number of customers	1		1
Industry services | Customer Concentration Risk | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	12.00%		12.00%