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Share-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2012
Stock Options [Member]
Aug. 31, 2011
Stock Options [Member]
item
Aug. 31, 2010
Stock Options [Member]
item
Aug. 31, 2012
Performance Awards [Member]
Aug. 31, 2011
Performance Awards [Member]
Aug. 31, 2010
Performance Awards [Member]
Aug. 31, 2012
Performance Awards [Member]
3 Years Or Less [Member]
Aug. 31, 2012
Performance Awards [Member]
3 To 5 Years [Member]
Aug. 31, 2012
Performance Awards [Member]
3 To 5 Years [Member]
Minimum [Member]
Aug. 31, 2012
Performance Awards [Member]
3 To 5 Years [Member]
Maximum [Member]
Aug. 31, 2012
Fiscal 2012 Executive Award [Member]
Aug. 31, 2011
Fiscal 2011 Executive Award [Member]
employee
Aug. 31, 2012
Fiscal 2010 Long-Term Incentive Plan Award [Member]
Aug. 31, 2010
Fiscal 2010 Long-Term Incentive Plan Award [Member]
Aug. 31, 2012
Fiscal 2010 Long-Term Incentive Plan Award [Member]
Aug. 31, 2012
Unvested Share Awards [Member]
Aug. 31, 2011
Unvested Share Awards [Member]
Aug. 31, 2010
Unvested Share Awards [Member]
Aug. 31, 2011
Executive Leadership Award [Member]
employee
Aug. 31, 2012
Client Partner And Consultant Award [Member]
employee
Aug. 31, 2011
Client Partner And Consultant Award [Member]
employee
H
Aug. 31, 2011
Tranche 1 [Member]
Stock Options [Member]
Aug. 31, 2010
Tranche 1 [Member]
Stock Options [Member]
Aug. 31, 2012
Tranche 1 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2011
Tranche 2 [Member]
Stock Options [Member]
Aug. 31, 2010
Tranche 2 [Member]
Stock Options [Member]
Aug. 31, 2011
Tranche 3 [Member]
Stock Options [Member]
Aug. 31, 2010
Tranche 3 [Member]
Stock Options [Member]
Aug. 31, 2011
Tranche 4 [Member]
Stock Options [Member]
Aug. 31, 2010
Tranche 4 [Member]
Stock Options [Member]
Aug. 31, 2012
Adjusted EBITDA [Member]
Fiscal 2012 Executive Award [Member]
item
Aug. 31, 2012
Adjusted EBITDA [Member]
Tranche 1 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2012
Adjusted EBITDA [Member]
Tranche 2 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2012
Adjusted EBITDA [Member]
Tranche 3 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2012
Productivity Practice Sales [Member]
Fiscal 2012 Executive Award [Member]
item
Aug. 31, 2012
Productivity Practice Sales [Member]
Tranche 1 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2012
Productivity Practice Sales [Member]
Tranche 2 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2012
Productivity Practice Sales [Member]
Tranche 3 [Member]
Fiscal 2012 Executive Award [Member]
Aug. 31, 2010
Vesting Date 1 [Member]
Fiscal 2010 Long-Term Incentive Plan Award [Member]
Aug. 31, 2010
Vesting Date 2 [Member]
Fiscal 2010 Long-Term Incentive Plan Award [Member]
Aug. 31, 2010
Vesting Date 3 [Member]
Fiscal 2010 Long-Term Incentive Plan Award [Member]
Aug. 31, 2013
Scenario, Forecast [Member]
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                          
Shares available for granting 770,000                                                                                        
Shares remaining in employee stock purchase plan 615,000                                                                                        
Period which common stock price must average over specified levels             5 days                                                                            
Period to achieve specified levels of common stock price                   3 years   3 years 5 years                                                                
Percent of shares which will vest                   100.00% 50.00%                                                                    
Percent of performance award to be granted             25.00% 50.00%                                                                         25.00%
Shares granted             177,616 294,158             24,045               6,000 16,000                                          
Fair value             $ 1,200,000 $ 2,600,000                                                                          
Amortization period             1 year 4 months 24 days 10 months 24 days             1 year 2 months 12 days                                                            
Unrecognized compensation cost             1,000,000                       100,000                                                    
Number of tranches         4 4                                                       3       3              
Shares authorized to be issued                           106,101 72,134                                                            
Shares to vest after meeting certain requirements                                                                   24,757       10,610              
Adjusted EBITDA                                                                     26,000,000 33,000,000 40,000,000                
Productivity Practice sales                                                                             20,500,000 23,500,000 26,500,000        
Life of performance awards                           6 years                                                              
Percent of shares plan participants are entitled to                                   94.70%                                                      
Shares vested 37,960                                 172,737                 24,757                                    
Compensation cost 3,835,000 2,788,000 1,099,000 168,000 820,000 261,000 3,188,000 827,000 327,000           300,000       340,000 411,000 458,000 500,000 100,000 100,000                                          
Target number of shares expected to vest                                 182,385                                                        
Vesting date                                                                                   Aug. 31, 2012 Feb. 28, 2013 Aug. 31, 2013  
Grant date fair value of common stock         $ 8.43 $ 5.28 $ 9.55 $ 11.34                 $ 5.28                                                        
Contractual life         10 years 10 years                     4 years                                                        
Exercise price $ 11.25 $ 11.25                                             $ 9.00 $ 9.00   $ 10.00 $ 10.00 $ 12.00 $ 12.00 $ 14.00 $ 14.00                        
Stock options exercised          4,061                                                                                
Additional shares expected to vest                               40,000                                                          
Intrinsic value of stock options exercised         36,750                                                                                
Whole-share grant per eligible director                                     50,000                                                    
Vesting period of awards                                     1 year                                                    
Shares issued under terms of the award                                     37,975 37,960 61,064                                                
Fair value of shares awarded                                     300,000                                                    
Cost of common stock issued from treasury                                     500,000 600,000 900,000                                                
Weighted-average vesting period for recognition                                     3 months                                                    
Total recognized tax benefit from unvested stock awards                                     100,000 100,000 200,000                                                
Intrinsic value of unvested stock awards                                     400,000                                                    
Target number of shares for Executive Leadership Award                                           72,134                                              
Granted as fully vested shares                                           48,049                                              
Shares granted per person                                               2,000                                          
Number of individuals who qualified for award                             3             3 3 8                                          
Threshold of cumulative sales over the career in order to receive common stock                                               20,000,000                                          
Threshold of consulting hours performed over the career in order to receive common stock                                               1,500                                          
Price of common stock as a percent of the average fair market value 85.00%                                                                                        
Shares issued to employee stock purchase plan participants 55,423 49,962 56,475                                                                                    
Cost basis of shares issued to employee stock purchase plan participants 800,000 700,000 800,000                                                                                    
Cash proceeds from employee stock purchase plan participants $ 435,000 $ 328,000 $ 288,000