Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Nov. 30, 2016 USD ($) period plan $ / shares Executives shares	Nov. 30, 2015 USD ($) $ / shares Executives shares	Nov. 30, 2014 USD ($) $ / shares Executives shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shareholder approved stock plans | plan	1
Number of plans for which shareholder approval not required | plan	2
Closing stock price on November 30, 2016 (in dollars per share) | $ / shares	$ 29.57
Unrecognized stock-based compensation expense, net of expected forfeitures | $	$ 19,500
Costs are expected to be recognized, weighted average period	1 year 10 months 24 days
Number of executives whose employment was terminated | Executives	2	3	2
Total stock-based compensation | $	$ 22,541	$ 24,004	$ 24,873
Additional stock-based compensation expenses related to separation and acceleration vesting | $	$ 300	$ 300	$ 1,200
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)	54,510,000
Shares available for grant under stock plans (in shares)	4,521,032
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)	888,368
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
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)	9,450,000
ESPP offering period	27 months
ESPP number of purchase periods | period	9
ESPP purchase price (as a percent)	85.00%
Employee stock purchase plan, issued shares (in shares)	266,000	226,000	203,000
Weighted average purchase price of shares (in dollars per share) | $ / shares	$ 20.01	$ 19.58	$ 17.84
Shares available and reserved for issuance (in shares)	1,035,000
Weighted average estimated fair value of options granted, per share (in dollars per share) | $ / shares	$ 7.43	$ 6.89	$ 6.93
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation | $	$ 7,584	$ 13,149	$ 14,330
Additional stock-based compensation expenses related to separation and acceleration vesting | $		200	500
Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation | $	4,093	4,805	4,642
Additional stock-based compensation expenses related to separation and acceleration vesting | $	200	$ 100	$ 700
Product development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional stock-based compensation expenses related to separation and acceleration vesting | $	$ 100
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Weighted average estimated fair value of options granted, per share (in dollars per share) | $ / shares		$ 6.79	$ 5.95
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
Stock-based compensation service period	3 years	3 years