Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2018	May 31, 2017
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 262,236	$ 205,283
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	141,607	117,011
Trasmission & Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	78,671	45,162
Power Generation [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 41,958	$ 43,110