CUSTOMER CONCENTRATIONS (Details) $ in Millions	12 Months Ended
	Jan. 31, 2019 USD ($) Owner customer	Jan. 31, 2018 USD ($) Owner customer	Jan. 31, 2017 customer
Customer Concentrations
Amounts retained by project owners		$ 69.7
Percentage of amounts retained by project owners	93.00%	99.00%
Accounts Receivable
Customer Concentrations
Number of project owners | Owner	5	5
Major Customer One
Customer Concentrations
Amounts retained by project owners	$ 5.8	$ 19.3
Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	25.00%	17.00%
Major Customer Two
Customer Concentrations
Amounts retained by project owners	$ 4.5	$ 18.7
Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer	15.00%	17.00%
Major Customer Three
Customer Concentrations
Amounts retained by project owners	$ 1.6	$ 14.1
Major Customer Four
Customer Concentrations
Amounts retained by project owners	1.3	13.4
Major Customer Five
Customer Concentrations
Amounts retained by project owners	$ 1.0	$ 3.2
Power Services | Revenue
Customer Concentrations
Percentage of major customers or segments	76.00%	91.00%	87.00%
Number of major power industry service customers | customer	4	4	5
Power Services | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	16.00%	29.00%	20.00%
Power Services | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments	14.00%	26.00%	18.00%
Power Services | Major Customer Three | Revenue
Customer Concentrations
Percentage of major customers or segments	12.00%	15.00%	17.00%
Power Services | Major Customer Four | Revenue
Customer Concentrations
Percentage of major customers or segments	10.00%	14.00%	14.00%
Power Services | Major Customer Five | Revenue
Customer Concentrations
Percentage of major customers or segments			10.00%