Revenues (Tables)
 3 Months Ended
May 31, 2019
Revenues [Abstract]  
Disaggregation of Revenue [Table Text Block]
Disaggregated Revenue
The following table presents disaggregated revenue by customer industry (in thousands):
 
 
Three Months Ended May 31,
 
 
2019
 
2018
Net sales:
 
 
 
 
Industrial - oil and gas, construction, and general
 
$
164,800

 
$
151,308

Transmission and distribution
 
72,281

 
65,954

Power generation
 
52,042

 
44,974

Total net sales
 
$
289,123

 
$
262,236
Contract with Customer, Asset and Liability [Table Text Block]
Contract Liabilities
The following table shows the changes in contract liabilities for the three months ended May 31, 2019 and 2018, respectively (in thousands):
 
 
May 31, 2019
 
May 31, 2018
Balance at beginning of period
 
$
56,928

 
$
22,698

Contract liabilities added during the period
 
10,970

 
16,441

Revenue recognized during the period
 
(45,579
)
 
(17,301
)
Balance at end of period
 
$
22,319

 
$
21,838