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Major Customers (Details) (Power Industry Services [Member])
3 Months Ended
Apr. 30, 2013
Customers
Apr. 30, 2012
Customers
Major Customers (Textual) [Abstract]    
Percentage of consolidated net revenue accounted by major segment 94.00% 91.00%
Number of major customers 2 3
Major customer one [Member]
   
Major Customers (Textual) [Abstract]    
Percentage of consolidated net revenue accounted by major customers 45.00% 47.00%
Major customer two [Member]
   
Major Customers (Textual) [Abstract]    
Percentage of consolidated net revenue accounted by major customers 44.00% 19.00%
Major customer three [Member]
   
Major Customers (Textual) [Abstract]    
Percentage of consolidated net revenue accounted by major customers   14.00%