Stock Compensation - Fair Value Assumptions (Details) - Stock Appreciation Rights (SARs) [Member]
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12 Months Ended |
Feb. 29, 2016 |
Feb. 28, 2015 |
Feb. 28, 2014 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected life in years |
7 years
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| Employee Stock Purchase Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected price volatilty (minimum) |
35.39%
|
36.34%
|
45.00%
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| Expected price volatility (maximum) |
40.00%
|
53.00%
|
47.83%
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| Risk-free interest rate (minimum) |
2.32%
|
75.00%
|
59.00%
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| Risk-free interest rate (maximum) |
2.73%
|
2.98%
|
89.00%
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| Employee Stock Purchase Plan [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected life in years |
4 years 6 months
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4 years 6 months
|
4 years 6 months
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| Expected dividend yield |
1.20%
|
1.21%
|
1.76%
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| Employee Stock Purchase Plan [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected life in years |
4 years 6 months
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4 years 6 months
|
4 years 6 months
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| Expected dividend yield |
1.32%
|
1.49%
|
1.95%
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