SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment and Revenue Recognition (Details)	12 Months Ended
	Jan. 31, 2016 USD ($) category project
Liquidated Damages | Pending Litigation
Summary of significant accounting policies
The number of projects where the Company may be subject to liquidated damages claims | project	1
Potential amount of damages sought by plaintiff at end of contract	$ 11,100,000
Potential maximum daily liquidated damages amount	$ 175,000
Power Industry Services
Summary of significant accounting policies
Number of categories | category	2
Minimum
Summary of significant accounting policies
Estimated useful lives of the assets	5 years
Minimum | Power Industry Services
Summary of significant accounting policies
Revenue recognition period	3 months
Maximum
Summary of significant accounting policies
Estimated useful lives of the assets	39 years
Maximum | Power Industry Services
Summary of significant accounting policies
Revenue recognition period	3 years