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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%

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