Concentrations of Risk and Major Customers - Additional Information (Detail) (Customer Concentration Risk)	12 Months Ended
Feb. 28, 2013	Feb. 29, 2012
Lockheed Martin
Concentration Risk [Line Items]
Consolidated net sales percentage	14.80%
Number of customer	1
U S Government
Concentration Risk [Line Items]
Concentration risk, percentage of consolidated net sales	37.00%	42.00%
Foreign Country
Concentration Risk [Line Items]
Concentration risk, percentage of consolidated net sales	9.00%	9.00%

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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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