Major Customers (Details) (Power Industry Services [Member])	3 Months Ended		6 Months Ended
	Jul. 31, 2013 Customers	Jul. 31, 2012 Customers	Jul. 31, 2013 Customers	Jul. 31, 2012 Customers
Major Customers (Textual) [Abstract]
Percentage of consolidated net revenue accounted by major segment	96.00%	95.00%	95.00%	93.00%
Number of major power industry service customers	3	2	3	2
Major customer one [Member]
Major Customers (Textual) [Abstract]
Percentage of consolidated net revenue accounted by major customers	43.00%	62.00%	43.00%	56.00%
Major customer two [Member]
Major Customers (Textual) [Abstract]
Percentage of consolidated net revenue accounted by major customers	36.00%	12.00%	40.00%	11.00%
Major customer three [Member]
Major Customers (Textual) [Abstract]
Percentage of consolidated net revenue accounted by major customers	12.00%			11.00%