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Share-Based Compensation Plans - Non-vested stock option activity (Details) - $ / shares	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Non-Vested Options
Grants (in shares)	0
Stock Option Officers Employees and Consultants
Non-Vested Options
Outstanding at the beginning of the period (in shares)	280,000	521,000	674,000
Grants (in shares)		2,000	186,000
Vested or forfeited (in shares)	(155,000)	(243,000)	(339,000)
Outstanding at the end of the period (in shares)	125,000	280,000	521,000
Weighted Average Grant Date Fair Value (per share)
Outstanding at the beginning of the period (in dollars per share)	$ 22.48	$ 20.81	$ 16.98
Grants (in dollars per share)		28.74	28.82
Vested or forfeited (in dollars per share)	25.02	18.95	17.59
Outstanding at the end of the period (in dollars per share)	$ 19.31	$ 22.48	$ 20.81

X

- Definition

Represents the combined number of options vested and non-vested options forfeited.

+ References

No definition available.

+ Details

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- Definition

Combined weighted average grant-date fair value of options vested and non-vested for options forfeited.

+ References

No definition available.

+ Details

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Number of non-vested options outstanding.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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