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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
|---|---|
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Feb. 29, 2012
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Number of executives whose employment was terminated | 1 |
| Additional stock-based compensation expenses related to separation and acceleration vesting | $ 0.6 |
|
Restricted Stock Units [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Service period of awards (in years) | 3 |
|
Restricted Stock Awards [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Service period of awards (in years) | 3 |
|
Minimum [Member] | Options [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Service period of awards (in years) | 4 |
|
Maximum [Member] | Options [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Service period of awards (in years) | 5 |