| Share-based Compensation Arrangement by Share-based Payment Award, Remaining Contractual Term, Outstanding and Exercisable (Details) | 12 Months Ended | 
|---|---|
| Nov. 30, 2012 | |
| Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 1 | 3.2 | 
| Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 2 | 2.6 | 
| Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 3 | 3.2 | 
| Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 4 | 2.6 | 
| X | ||||||||||
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- Definition Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 3 No definition available. 
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| X | ||||||||||
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- Definition Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 1 No definition available. 
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| X | ||||||||||
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- Definition Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 4 No definition available. 
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| X | ||||||||||
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- Definition Stock Based Compensation Share-based Compensation Arrangement By Share-based Payment Award, Remaining Contractual Term, Outstanding And Exercisable 2 No definition available. 
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