Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013 Executives	May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 5,881,000	$ 6,669,000	$ 10,787,000	$ 13,760,000
Number of executives whose employment was terminated			3
Additional stock-based compensation expenses related to separation and acceleration vesting (in dollars)		1,200,000		1,800,000
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation award service period (in years)			4 years
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation award service period (in years)			5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation award service period (in years)			3 years
Accelerated Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 600,000		$ 600,000