LEGAL MATTERS (Details) $ in Millions			3 Months Ended
	Mar. 04, 2016 USD ($)	Feb. 01, 2016 USD ($) project	Apr. 30, 2018 USD ($)
PPS Engineers, Inc. claims lawsuit | Pending Litigation
Loss Contingencies
Amount of damages sought by plaintiff		$ 2.3
Number of significant project locations involved in the lawsuit | project		1
Damages sought against bond of the project		$ 2.5
Counter claim amount sought	$ 4.9
Former subcontractor | GPS
Loss Contingencies
Amount of damages sought by plaintiff			$ 11.0