CUSTOMER CONCENTRATIONS (Details) - customer	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Customer Concentration Risk | Accounts Receivable
Customer Concentrations
Number of customers			2		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			25.00%		26.00%
Customer Concentration Risk | Major Customer One | Contract Asset
Customer Concentrations
Percentage of major customers or segments			30.00%		64.00%
Customer Concentration Risk | Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			21.00%		11.00%
Customer Concentration Risk | Major Customer Two | Contract Asset
Customer Concentrations
Percentage of major customers or segments			12.00%		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	80.00%	86.00%	77.00%	83.00%
Power Services | Customer Concentration Risk | Revenue
Customer Concentrations
Number of customers	1	1	1	1
Power Services | Customer Concentration Risk | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	56.00%	70.00%	61.00%	69.00%
Industry services | Product Concentration Risk | Revenue
Customer Concentrations
Percentage of major customers or segments	17.00%	12.00%	20.00%	15.00%
Industry services | Customer Concentration Risk | Revenue
Customer Concentrations
Number of customers			1
Industry services | Customer Concentration Risk | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments			11.00%