Stock-Based Compensation (Narrative) (Details)	3 Months Ended
	Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award market condition period	3 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation award service period (in years)	4 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation award service period (in years)	3 years