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Comprehensive Income (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
|
Aug. 31, 2012
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Aug. 31, 2013
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Aug. 31, 2012
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Feb. 28, 2013
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| Comprehensive Income [Abstract] | ||||
| Tax benefit adjustment related to prior years | $ 1,270,000 | $ 1,270,000 | ||
| Deferred tax | $ 32,100,000 | $ 35,900,000 | ||