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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Nov. 30, 2018
Accounting Policies [Abstract]  
Disaggregation of Revenue [Table Text Block]
Disaggregated Revenue
Revenue by segment and geography is disclosed in Note 5. In addition, the following table presents disaggregated revenue by customer industry (in thousands):
 
 
Three Months Ended November 30,
 
Nine Months Ended November 30,
 
 
2018
 
2017
 
2018
 
2017
Net sales:
 
 
 
 
 
 
 
 
Industrial - oil and gas, construction, and general
 
$
143,710

 
$
126,976

 
$
415,323

 
$
355,895

Transmission and distribution
 
35,927

 
45,795

 
162,033

 
130,134

Power generation
 
59,879

 
35,387

 
147,183

 
123,741

Total net sales
 
$
239,516

 
$
208,158

 
$
724,539

 
$
609,770