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Major Customers - Additional Information (Detail) (Power Industry Services [Member])	3 Months Ended
	Apr. 30, 2014 Customer	Apr. 30, 2013 Customer
Revenue, Major Customer [Line Items]
Percentage of consolidated net revenue accounted by major segment	97.00%	94.00%
Number of major power industry service customers	3	2
Major Customer One [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage of consolidated net revenue accounted by major customers	38.00%	45.00%
Major Customer Two [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage of consolidated net revenue accounted by major customers	35.00%	44.00%
Major Customer Three [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage of consolidated net revenue accounted by major customers	23.00%

X

- Definition

Entity wide revenue major segment percentage.

+ References

No definition available.

+ Details

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- Definition

Number of major customers.

+ References

No definition available.

+ Details

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Details

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