Stock Option Plan and Stock Based Compensation - Summary of Stock Options Outstanding (Detail)	12 Months Ended
Feb. 28, 2019 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding, Options Outstanding \| shares	61,590
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	1 year 9 months 18 days
Weight Average Exercise Price, Options Outstanding	$ 15.88
Number Exercisable, Options Exercisable \| shares	61,590
Weight Average Exercise Price, Options Exercisable	$ 15.88
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices	$ 8.94
Number Outstanding, Options Outstanding \| shares	10,000
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	2 months 12 days
Weight Average Exercise Price, Options Outstanding	$ 8.94
Number Exercisable, Options Exercisable \| shares	10,000
Weight Average Exercise Price, Options Exercisable	$ 8.94
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower range	14.05
Exercise Prices, Upper range	$ 15.48
Number Outstanding, Options Outstanding \| shares	12,949
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	3 years 3 months 18 days
Weight Average Exercise Price, Options Outstanding	$ 15.18
Number Exercisable, Options Exercisable \| shares	12,949
Weight Average Exercise Price, Options Exercisable	$ 15.18
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower range	17.57
Exercise Prices, Upper range	$ 18.46
Number Outstanding, Options Outstanding \| shares	38,641
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	1 year 9 months 18 days
Weight Average Exercise Price, Options Outstanding	$ 17.92
Number Exercisable, Options Exercisable \| shares	38,641
Weight Average Exercise Price, Options Exercisable	$ 17.92

Share based compensation shares authorized under stock option plans exercise price range.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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- Definition

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

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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