CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE (Details) - customer	3 Months Ended		12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2017
Accounts Receivable
Major Customers
Number of major power industry service customers	4		4
Major Customer One | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer	18.00%		18.00%
Major Customer Two | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer	17.00%		17.00%
Major Customer Three | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer	15.00%		17.00%
Major Customer Four | Accounts Receivable
Major Customers
Percentage of consolidated accounts receivable accounted by major customer	12.00%		11.00%
Power Services | Revenue
Major Customers
Percentage of major customers or segments	91.00%	83.00%
Number of major power industry service customers	4	5
Power Services | Major Customer One | Revenue
Major Customers
Percentage of major customers or segments	29.00%	18.00%
Power Services | Major Customer Two | Revenue
Major Customers
Percentage of major customers or segments	21.00%	15.00%
Power Services | Major Customer Three | Revenue
Major Customers
Percentage of major customers or segments	21.00%	15.00%
Power Services | Major Customer Four | Revenue
Major Customers
Percentage of major customers or segments	18.00%	12.00%
Power Services | Major Customer Five | Revenue
Major Customers
Percentage of major customers or segments		10.00%