Options Outstanding and Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Feb. 28, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options Outstanding	73
Options Outstanding Weighted Average Remaining Contractual Life (in years)	4 years 1 month 6 days
Options Outstanding Weighted Average Exercise Price	$ 4.10
Number of options Exercisable	44
Options Exercisable Weighted Average Exercise Price	$ 4.66
$2.44 - 2.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range exercise prices	$ 2.44
Upper ranges of exercise prices	$ 2.44
Number of options Outstanding	9
Options Outstanding Weighted Average Remaining Contractual Life (in years)	3 years
Options Outstanding Weighted Average Exercise Price	$ 2.44
Number of options Exercisable	0
Options Exercisable Weighted Average Exercise Price	$ 2.44
3.20 - 3.27
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range exercise prices	$ 3.20
Upper ranges of exercise prices	$ 3.27
Number of options Outstanding	17
Options Outstanding Weighted Average Remaining Contractual Life (in years)	5 years 10 months 24 days
Options Outstanding Weighted Average Exercise Price	$ 3.18
Number of options Exercisable	7
Options Exercisable Weighted Average Exercise Price	$ 3.20
3.59 - 3.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range exercise prices	$ 3.59
Upper ranges of exercise prices	$ 3.65
Number of options Outstanding	18
Options Outstanding Weighted Average Remaining Contractual Life (in years)	3 years
Options Outstanding Weighted Average Exercise Price	$ 3.62
Number of options Exercisable	18
Options Exercisable Weighted Average Exercise Price	$ 3.62
4.00 - 4.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range exercise prices	$ 4.00
Upper ranges of exercise prices	$ 4.20
Number of options Outstanding	18
Options Outstanding Weighted Average Remaining Contractual Life (in years)	5 years 7 months 6 days
Options Outstanding Weighted Average Exercise Price	$ 4.11
Number of options Exercisable	8
Options Exercisable Weighted Average Exercise Price	$ 4.00
7.65 - 7.71
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range exercise prices	$ 7.65
Upper ranges of exercise prices	$ 7.71
Number of options Outstanding	11
Options Outstanding Weighted Average Remaining Contractual Life (in years)	1 year 9 months 18 days
Options Outstanding Weighted Average Exercise Price	$ 7.68
Number of options Exercisable	11
Options Exercisable Weighted Average Exercise Price	$ 7.68

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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