CUSTOMER CONCENTRATIONS (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2018 USD ($) customer	Jul. 31, 2017 customer	Jul. 31, 2018 USD ($) Owner customer	Jul. 31, 2017 customer	Jan. 31, 2018 USD ($) Owner
Customer Concentrations
Amounts retained by project owners	$ 23.4		$ 23.4		$ 69.7
Percentage of amounts retained by project owners			87.00%		99.00%
Accounts Receivable
Customer Concentrations
Number of project owners | Owner			3		5
Major Customer One
Customer Concentrations
Amounts retained by project owners	14.2		$ 14.2		$ 19.3
Major Customer One | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			19.00%		18.00%
Major Customer Two
Customer Concentrations
Amounts retained by project owners	5.0		$ 5.0		$ 18.7
Major Customer Two | Accounts Receivable
Customer Concentrations
Percentage of consolidated accounts receivable accounted by major customer			13.00%		18.00%
Major Customer Three
Customer Concentrations
Amounts retained by project owners	$ 1.2		$ 1.2		$ 14.1
Major Customer Four
Customer Concentrations
Amounts retained by project owners					13.4
Major Customer Five
Customer Concentrations
Amounts retained by project owners					$ 3.2
Power Services | Revenue
Customer Concentrations
Percentage of major customers or segments	77.00%	92.00%	82.00%	92.00%
Number of major power industry service customers | customer	4	4	3	4
Power Services | Major Customer One | Revenue
Customer Concentrations
Percentage of major customers or segments	18.00%	31.00%	20.00%	28.00%
Power Services | Major Customer Two | Revenue
Customer Concentrations
Percentage of major customers or segments	16.00%	27.00%	14.00%	26.00%
Power Services | Major Customer Three | Revenue
Customer Concentrations
Percentage of major customers or segments	11.00%	17.00%	13.00%	19.00%
Power Services | Major Customer Four | Revenue
Customer Concentrations
Percentage of major customers or segments	10.00%	13.00%		15.00%