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Share-Based Compensation Plans - Summary of stock option activity (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Options
Outstanding at the beginning of the period (in shares)	300	448	649
Grants (in shares)	0	0	2
Exercises (in shares)	(126)	(126)	(170)
Forfeitures / expirations (in shares)	(11)	(22)	(33)
Outstanding at the end of the period (in shares)	163	300	448	649
Exercisable at the end of the period (in shares)	126
Weighted Average Exercise price (per share)
Outstanding at the beginning of the period (in usd per share)	$ 58.35	$ 57.41	$ 53.94
Grants (in usd per share)	0.00	0.00	102.04
Exercises (in usd per share)	49.82	52.28	43.07
Forfeitures / expirations (in usd per share)	80.33	72.37	65.68
Outstanding at the end of the period (in usd per share)	63.47	58.35	57.41	$ 53.94
Exercisable at the end of the period (in usd per share)	58.20
Weighted Average Grant Date Fair Value (per share)
Outstanding at the beginning of the period (in usd per share)	32.04	20.54	19.52
Grants (in usd per share)	0.00	0.00	28.74
Outstanding at the end of the period (in usd per share)	48.64	$ 32.04	$ 20.54	$ 19.52
Exercisable at the end of the period (in usd per share)	$ 53.91
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term (in years)	3 years 7 months 6 days	4 years 3 months 18 days	5 years	6 years 1 month 6 days
Exercisable at the end of the period	3 years 4 months 24 days
Intrinsic Value
Outstanding at the beginning of the period	$ 9,606	$ 18,097	$ 26,847
Exercises	6,414	5,400	9,152
Outstanding at the beginning of the period	7,925	$ 9,606	$ 18,097	$ 26,847
Exercisable at the end of the period	$ 6,811

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- Definition

Represents the weighted average grant-date fair value of options outstanding and currently exercisable under the stock option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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

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