DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Description of the Business
Unapproved change orders contract amount	$ 0
Power Services | Minimum
Description of the Business
Revenue recognition period	1 month
Power Services | Maximum
Description of the Business
Revenue recognition period	3 years
GPS
Description of the Business
Consolidated revenues by subsidiaries	89.00%	83.00%