Stock Compensation - Schedule By Exercise Price Range (Details) - $ / shares	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Options/ SAR’s (shares)	148,513	170,139	312,748	376,982
Weighted Average Exercise Price, Outstanding (usd per share)	$ 43.29	$ 42.02	$ 34.23	$ 31.27
Options / SAR’s Currently Exercisable (shares)	148,513	126,975	217,961
Weighted Average Exercise Price, Exercisable (usd per share)	$ 43.29	$ 41.27	$ 29.83
$9.06 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (usd per share)	$ 25.67
Total Options/ SAR’s (shares)	9,080
Average Remaining Life	1 year
Weighted Average Exercise Price, Outstanding (usd per share)	$ 25.67
Options / SAR’s Currently Exercisable (shares)	9,080
Weighted Average Exercise Price, Exercisable (usd per share)	$ 25.67
$15.84 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (usd per share)	$ 39.65
Total Options/ SAR’s (shares)	950
Average Remaining Life	2 years 6 months 8 days
Weighted Average Exercise Price, Outstanding (usd per share)	$ 39.65
Options / SAR’s Currently Exercisable (shares)	950
Weighted Average Exercise Price, Exercisable (usd per share)	$ 39.65
$20.91 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (usd per share)	$ 43.92
Total Options/ SAR’s (shares)	82,378
Average Remaining Life	3 years 4 days
Weighted Average Exercise Price, Outstanding (usd per share)	$ 43.92
Options / SAR’s Currently Exercisable (shares)	82,378
Weighted Average Exercise Price, Exercisable (usd per share)	$ 43.92
$25.67 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (usd per share)	$ 45.26
Total Options/ SAR’s (shares)	40,000
Average Remaining Life	2 years 8 months 5 days
Weighted Average Exercise Price, Outstanding (usd per share)	$ 45.26
Options / SAR’s Currently Exercisable (shares)	40,000
Weighted Average Exercise Price, Exercisable (usd per share)	$ 45.26
$45.36 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (usd per share)	$ 45.36
Total Options/ SAR’s (shares)	16,105
Average Remaining Life	2 years
Weighted Average Exercise Price, Outstanding (usd per share)	$ 45.36
Options / SAR’s Currently Exercisable (shares)	16,105
Weighted Average Exercise Price, Exercisable (usd per share)	$ 45.36
$9.06 - $45.36 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower limit (usd per share)		9.06
Exercise price range, upper limit (usd per share)		$ 46.43
$9.06 - $45.36 [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Options/ SAR’s (shares)	148,513
Average Remaining Life	2 years 8 months 5 days
Weighted Average Exercise Price, Outstanding (usd per share)	$ 43.29
Options / SAR’s Currently Exercisable (shares)	148,513
Weighted Average Exercise Price, Exercisable (usd per share)	$ 43.29