Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Nov. 30, 2013 plan	Nov. 30, 2012 Executives	Nov. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shareholder approved stock plans	1
Number of plans for which shareholder approval not required	2
Closing stock price on November 30, 2013	$ 26.34
Options included in stock-swap	41,000
Exercise of stock options, shares	2,722,000
Unrecognized stock-based compensation expense, net of expected forfeitures	$ 22,000,000
Costs are expected to be recognized, weighted average period	2 years
Stock-based compensation	21,399,000	28,233,000	25,999,000
Number of executives whose employment was terminated		3
Additional stock-based compensation expenses related to separation and acceleration vesting		1,800,000
2008 Stock Option And Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)	47,010,000
Shares available for grant under stock plans (in shares)	9,703,158
2002 Nonqualified Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)	9,750,000
Shares available for grant under stock plans (in shares)	797,910
2004 Inducement Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)	1,500,000
Shares available for grant under stock plans (in shares)	583,021
Stock Options Granted Prior To Fiscal 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	10 years
Stock Options Granted From Fiscal 2005 Through Fiscal 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	7 years
Stock Options Granted In 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	7 years
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)	8,650,000
ESPP offering period	27 months
ESPP number of purchase periods	9
ESPP purchase price	85.00%
Employee stock purchase plan, issued shares (in shares)	281,000	376,000	594,000
Weighted average purchase price of shares (in dollars per share)	$ 15.28	$ 15.04	$ 11.52
Shares available and reserved for issuance (in shares)	930,000
Weighted average estimated fair value of options granted, per share (in dollars per share)	$ 6.88	$ 6.53	$ 6.44
CEO Separation Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			15 months
Previous exercise period			P3M
Stock-based compensation			4,600,000
General And Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	10,186,000	10,983,000	12,888,000
Additional stock-based compensation expenses related to separation and acceleration vesting		900,000
Sales And Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	3,599,000	3,274,000	2,648,000
Additional stock-based compensation expenses related to separation and acceleration vesting		900,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	4 years 9 months 18 days	4 years 9 months 18 days	4 years 9 months 18 days
Weighted average estimated fair value of options granted, per share (in dollars per share)	$ 6.08	$ 5.66	$ 7.31
Stock Options [Member] | Stock Options Granted Prior To Fiscal 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Stock Options [Member] | Stock Options Granted From Fiscal 2005 Through Fiscal 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Stock Options [Member] | Stock Options Granted In 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of common stock shares each restricted stock unit represents (in shares)	1
Accelerated Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1,400,000	$ 1,300,000