CUSTOMER CONCENTRATIONS (Details) $ in Millions	12 Months Ended
	Jan. 31, 2020 USD ($) Owner customer	Jan. 31, 2019 USD ($) Owner customer	Jan. 31, 2018 customer
Customer Concentrations
Amounts retained by project owners	$ 20.0	$ 15.3
Percentage of amounts retained by project owners	82.00%	93.00%
Accounts Receivable
Customer Concentrations
Number of customers | customer	3	2
Number of project owners | Owner	3	5
Major Customer One
Customer Concentrations
Amounts retained by project owners	$ 6.5	$ 5.8
Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	24.00%	25.00%
Major Customer Two
Customer Concentrations
Amounts retained by project owners	$ 5.9	$ 4.5
Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	21.00%	15.00%
Major Customer Three
Customer Concentrations
Amounts retained by project owners	$ 4.0	$ 1.6
Major Customer Three | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	12.00%
Major Customer Four
Customer Concentrations
Amounts retained by project owners		1.3
Major Customer Five
Customer Concentrations
Amounts retained by project owners		$ 1.0
Power Services | Revenue
Customer Concentrations
Percentage of major customers or segments	57.00%	76.00%	91.00%
Number of customers | customer	2	4	4
Power Services | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	22.00%	16.00%	29.00%
Power Services | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments	15.00%	14.00%	26.00%
Power Services | Major Customer Three | Revenue
Customer Concentrations
Percentage of major customers or segments		12.00%	15.00%
Power Services | Major Customer Four | Revenue
Customer Concentrations
Percentage of major customers or segments		10.00%	14.00%