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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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