Stock Compensation - Schedule By Exercise Price Range (Details) - $ / shares
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12 Months Ended |
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Feb. 29, 2016 |
Feb. 28, 2015 |
Feb. 28, 2013 |
Feb. 29, 2012 |
| Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total Options/ SAR’s (shares) |
312,748
|
376,982
|
396,174
|
439,863
|
| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 34.23
|
$ 31.27
|
$ 26.64
|
$ 19.12
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| Options / SAR’s Currently Exercisable (shares) |
217,961
|
204,107
|
153,343
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|
| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 29.83
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$ 21.55
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$ 15.32
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| $9.06 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 9.06
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| Total Options/ SAR’s (shares) |
5,174
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| Average Remaining Life |
0 days
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 9.06
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| Options / SAR’s Currently Exercisable (shares) |
5,174
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 9.06
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| $15.84 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 15.84
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| Total Options/ SAR’s (shares) |
52,958
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| Average Remaining Life |
1 year
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 15.84
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| Options / SAR’s Currently Exercisable (shares) |
52,958
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 15.84
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| $20.91 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 20.905
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| Total Options/ SAR’s (shares) |
38,820
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| Average Remaining Life |
2 years
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 20.91
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| Options / SAR’s Currently Exercisable (shares) |
38,820
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 20.91
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| $25.67 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 25.67
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| Total Options/ SAR’s (shares) |
31,328
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| Average Remaining Life |
3 years
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 25.67
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| Options / SAR’s Currently Exercisable (shares) |
31,328
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 25.67
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| $45.36 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 39.65
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| Total Options/ SAR’s (shares) |
950
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| Average Remaining Life |
4 years 6 months 6 days
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 39.65
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| Options / SAR’s Currently Exercisable (shares) |
475
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 39.65
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| $45.26 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 43.92
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| Total Options/ SAR’s (shares) |
107,954
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| Average Remaining Life |
5 years 2 days
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 43.92
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| Options / SAR’s Currently Exercisable (shares) |
43,135
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 43.92
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| $42.08 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Range of Exercise Prices (usd per share) |
$ 45.26
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| Total Options/ SAR’s (shares) |
40,000
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| Average Remaining Life |
4 years 8 months 4 days
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 45.26
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| Options / SAR’s Currently Exercisable (shares) |
20,000
|
|
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 45.26
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|
|
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| $46.43 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Range of Exercise Prices (usd per share) |
$ 45.36
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|
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| Total Options/ SAR’s (shares) |
34,805
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| Average Remaining Life |
4 years
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 45.36
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|
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| Options / SAR’s Currently Exercisable (shares) |
25,565
|
|
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 45.36
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| $39.65 [Member] | Stock Appreciation Rights (SARs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Range of Exercise Prices (usd per share) |
$ 46.43
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| Total Options/ SAR’s (shares) |
759
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| Average Remaining Life |
4 years 8 months 18 days
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 46.43
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| Options / SAR’s Currently Exercisable (shares) |
506
|
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| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 46.43
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|
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| $9.06 - $45.36 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price range, lower limit (usd per share) |
9.06
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|
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| Exercise price range, upper limit (usd per share) |
$ 46.43
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| $9.06 - $45.36 [Member] | Stock Appreciation Rights (SARs) [Member] |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
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| Total Options/ SAR’s (shares) |
312,748
|
|
|
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| Average Remaining Life |
3 years 6 months 4 days
|
|
|
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| Weighted Average Exercise Price, Outstanding (usd per share) |
$ 34.23
|
|
|
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| Options / SAR’s Currently Exercisable (shares) |
217,961
|
|
|
|
| Weighted Average Exercise Price, Exercisable (usd per share) |
$ 29.83
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