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Stock Benefit Plans And Stock-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2011
Aug. 31, 2010
Nov. 30, 2010
Aug. 31, 2011
Maximum [Member]
Nonvested Stock Awards [Member]
Feb. 28, 2011
Maximum [Member]
Service-based Stock Awards [Member]
Feb. 28, 2011
Maximum [Member]
Employee Stock Options [Member]
Aug. 31, 2011
Minimum [Member]
Performance-based Restricted Stock Units [Member]
Aug. 31, 2011
Minimum [Member]
Nonvested Stock Awards [Member]
Feb. 28, 2011
Minimum [Member]
Service-based Stock Awards [Member]
Feb. 28, 2011
Minimum [Member]
Employee Stock Options [Member]
Aug. 31, 2011
2008 Equity Incentive Plan [Member]
Aug. 31, 2011
Performance-based Restricted Stock Units [Member]
Aug. 31, 2010
Performance-based Restricted Stock Units [Member]
Aug. 31, 2011
Performance-based Restricted Stock Units [Member]
Aug. 31, 2010
Performance-based Restricted Stock Units [Member]
Nov. 30, 2010
Performance-based Restricted Stock Units [Member]
Aug. 31, 2011
1996 Stock Option Plan [Member]
Aug. 31, 2011
Restricted Stock [Member]
Nov. 30, 2010
Restricted Stock [Member]
Aug. 31, 2011
Restricted Stock Units [Member]
Nov. 30, 2010
Restricted Stock Units [Member]
Aug. 31, 2011
1998 Director Option Plan [Member]
Aug. 31, 2011
2008 Employee Stock Purchase Plan [Member]
Aug. 31, 2011
2009 Deferred Compensation Plan [Member]
Aug. 31, 2011
Stock Option Grants [Member]
Aug. 31, 2011
Nonvested Stock Awards [Member]
Aug. 31, 2011
Nonvested Stock Awards [Member]
Aug. 31, 2011
Service-based Stock Awards [Member]
Aug. 31, 2010
Service-based Stock Awards [Member]
Aug. 31, 2011
Service-based Stock Awards [Member]
Aug. 31, 2010
Service-based Stock Awards [Member]
Aug. 31, 2011
Employee Stock Options [Member]
Aug. 31, 2010
Employee Stock Options [Member]
Aug. 31, 2011
Employee Stock Options [Member]
Aug. 31, 2010
Employee Stock Options [Member]
Aug. 31, 2011
ESPP [Member]
Aug. 31, 2010
ESPP [Member]
Number of shares available for grant or issuance                         6,000,000                     0 8,800,000 985,000,000                          
Number of shares underlying stock options outstanding 19,384,000   19,384,000   22,173,000               4,300,000           14,000,000         1,000,000                              
Number of shares underlying stock awards outstanding 9,407,000   9,407,000   10,065,000                 4,346,000   4,346,000   4,092,000   3,586,000 4,314,000 1,475,000 1,659,000                                
Number of shares issued under ESPP                                                 300,000                            
Total value of shares issued under ESPP                                                 $ 3,900,000                            
Total intrinsic value of stock options exercised     78,900,000 19,300,000                                                                      
Unrecognized compensation cost related to unvested awards                           31,200,000   31,200,000                     20,300,000 56,000,000 56,000,000                    
Estimated vesting or requisite service period (in years) of the share awards           four four four four three three three                                                      
Weighted-average recognition period (in years) of unvested awards                               2.9                     2.70 2.4                      
Total tax benefits realized from exercise of stock options and vesting of stock awards     11,800,000 18,500,000                                                                      
Number of underlying stock awards granted     1,759,000                         274,000   4,100,000   1,125,000   360,000             1,500,000                    
Total fair value of shares vested pursuant to stock awards     17,800,000                                                                        
Stock-based compensation 12,900,000 8,900,000 36,186,000 23,093,000                                                                      
Deferred tax benefit on stock-based compensation expenses 4,400,000 2,900,000 12,300,000 7,700,000                                                                      
Stock-based compensation cost related to stock awards                           $ 3,600,000 $ 1,800,000 $ 10,400,000 $ 3,100,000                         $ 6,300,000 $ 4,600,000 $ 17,600,000 $ 12,600,000 $ 2,700,000 $ 2,300,000 $ 7,200,000 $ 6,700,000 $ 1,000,000 $ 700,000
Percentage of forfeiture upon triggering non-GAAP EPS threshold                               20.00%                                              
Fall of non-GAAP EPS in percentage to trigger forfeiture                               10.00%