Share-Based Compensation Plans (Narrative) (Details) | Jan. 23, 2015shares | Apr. 30, 2014USD ($)$ / sharesshares | Aug. 31, 2015USD ($)item$ / sharesshares | Nov. 30, 2013itemshares | Mar. 02, 2013USD ($)shares | Dec. 01, 2012itemshares | Aug. 31, 2013shares | Mar. 02, 2013shares | Aug. 31, 2015USD ($)employeeitem$ / sharesshares | Aug. 31, 2014USD ($)employee$ / sharesshares | Aug. 31, 2013USD ($)employeeshares | Aug. 31, 2012itemshares | Aug. 31, 2011USD ($)$ / shares | Aug. 31, 2011item$ / shares | Aug. 31, 2015USD ($)$ / sharesshares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Common stock issued from treasury stock | | | | | | | | | | 134,614 | | | | | |
Shares withheld for tax, value | $ | | | | | | | | | | $ 300,000 | | | | | |
Shares withheld for tax | | | | | | | | | | 17,935 | | | | | |
Capitalized share-based compensation expense | $ | | | | | | | | | | | | | | | $ 0 |
Shares vested | | | | | | | | | 14,616 | | | | | | |
Number of tranches | item | | | | | | | | | 0 | | | | | | |
Exercise price | $ / shares | | | $ 11.41 | | | | | | $ 11.41 | $ 11.41 | | | | | $ 11.41 |
Number of shares | | | | | | | | | 24,210 | | | | | | |
Share-based compensation expense | $ | | | | | | | | | $ 2,536,000 | $ 3,534,000 | $ 3,589,000 | | | | |
Stock options exercised | | | | | | | | | | | | | | | |
Aggregate intrinsic value | $ | | | $ 3,361,000 | | | | | | $ 3,361,000 | | | | | | $ 3,361,000 |
Fiscal 2011 Grant [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | | $ 17 | | | | | | $ 17 | | | | | | $ 17 |
Average share price | $ / shares | | | 11.34 | | | | | | $ 11.34 | | | | | | 11.34 |
Number of shares | | | | | | | | | 294,158 | | | | | | |
Fiscal 2012 Grant [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | | 18.05 | | | | | | $ 18.05 | | | | | | 18.05 |
Average share price | $ / shares | | | 9.55 | | | | | | $ 9.55 | | | | | | 9.55 |
Number of shares | | | | | | | | | 177,616 | | | | | | |
Fiscal 2013 Grant [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | | 22 | | | | | | $ 22 | | | | | | 22 |
Average share price | $ / shares | | | 16.03 | | | | | | $ 16.03 | | | | | | 16.03 |
Number of shares | | | | | | | | | 120,101 | | | | | | |
Fiscal 2014 Grant 1 [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | | 22 | | | | | | $ 22 | | | | | | 22 |
Average share price | $ / shares | | | 19.68 | | | | | | $ 19.68 | | | | | | 19.68 |
Number of shares | | | | | | | | | 8,352 | | | | | | |
Fiscal 2014 Grant 2 [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Average share price | $ / shares | | | 20.01 | | | | | | $ 20.01 | | | | | | 20.01 |
Number of shares | | | | | | | | | 13,477 | | | | | | |
Share-based compensation expense | $ | | $ 200,000 | | | | | | | | | | | | | |
Minimum [Member] | Fiscal 2014 Grant 2 [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | | 18.05 | | | | | | $ 18.05 | | | | | | 18.05 |
Maximum [Member] | Fiscal 2014 Grant 2 [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | | $ 22 | | | | | | $ 22 | | | | | | $ 22 |
Stock Options [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Unrecognized compensation cost | $ | | | $ 0 | | | | | | $ 0 | | | | | | $ 0 |
Number of tranches | item | | | | | | | | | | | | | | 4 | |
Stock options exercised | | | | | | | | | | 43,750 | 0 | | | | |
Aggregate intrinsic value | $ | | | | | | | | | | $ 500,000 | | | | | |
Performance Awards [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Share-based incremental compensation expense from plan modification | $ | | | | | | | | | 700,000 | | | | | | |
Recognized share-based incremental compensation expense from plan modification | $ | | | | | | | | | 500,000 | | | | | | |
Share-based compensation expense | $ | | | | | | | | | $ 1,890,000 | $ 2,716,000 | $ 2,504,000 | | | | |
Fiscal 2015 Long Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Number of individual vesting conditions | item | | | | | | | | | 6 | | | | | | |
Number of performance measures | item | | | | | | | | | 2 | | | | | | |
Shares authorized to be issued | | | 112,464 | | | | | | 112,464 | | | | | | 112,464 |
Life of awards | | | | | | | | | 6 years | | | | | | |
Fiscal 2014 Long Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Number of individual vesting conditions | item | | | | 6 | | | | | | | | | | | |
Number of performance measures | item | | | | 2 | | | | | | | | | | | |
Shares authorized to be issued | | | | 89,418 | | | | | | | | | | | |
Fiscal 2013 Long Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Number of individual vesting conditions | item | | | | | | 6 | | | | | | | | | |
Number of performance measures | item | | | | | | 2 | | | | | | | | | |
Shares authorized to be issued | | | | | | 68,085 | | | | | | | | | |
Fiscal 2012 Long Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Number of individual vesting conditions | item | | | | | | | | | | | | 6 | | | |
Number of performance measures | item | | | | | | | | | | | | 2 | | | |
Shares authorized to be issued | | | | | | | | | | | | 106,101 | | | |
Fiscal 2010 Long-Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Shares vested | | | | | | | 12,524 | 18,003 | | | 171,414 | | | | |
Average share price | $ / shares | | | | | | | | | | | | | $ 5.28 | $ 5.28 | |
Contractual life | | | | | | | | | | | | | 4 years | | |
Common Stock Price Performance Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Period which common stock price must average over specified levels | | | | | | | | | 5 days | | | | | | |
Percent of performance award to be granted | | | | | | | | | | | 0.25% | 0.25% | 0.50% | | |
Number of employees with additional supplemental award | employee | | | | | | | | | | 3 | | | | | |
Common Stock Price Performance Award [Member] | 3 Years Or Less [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Period to achieve specified levels of common stock price | | | | | | | | | 3 years | | | | | | |
Percent of shares which will vest | | | | | | | | | 100.00% | | | | | | |
Common Stock Price Performance Award [Member] | 3 To 5 Years [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Percent of shares which will vest | | | | | | | | | 50.00% | | | | | | |
Common Stock Price Performance Award [Member] | 3 To 5 Years [Member] | Minimum [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Period to achieve specified levels of common stock price | | | | | | | | | 3 years | | | | | | |
Common Stock Price Performance Award [Member] | 3 To 5 Years [Member] | Maximum [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Period to achieve specified levels of common stock price | | | | | | | | | 5 years | | | | | | |
Common Stock Price Performance Award [Member] | After 5 Years [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Period of the specific price target were met | | | | | | | | | 5 years | | | | | | |
Target number of shares expected to vest | | | 0 | | | | | | 0 | | | | | | 0 |
Management Stock Loans [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Transfer of common stock shares as payment on the loans | | | | | 3,300,000 | | | | | | | | | | |
Share-based compensation expense | $ | | | | | $ 500,000 | | | | | | $ 498,000 | | | | |
Unvested Share Awards [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Unrecognized compensation cost | $ | | | $ 200,000 | | | | | | $ 200,000 | | | | | | $ 200,000 |
Whole-share grant per eligible director | $ | | | | | | | | | $ 75,000 | | | | | | |
Vesting period of awards | | | | | | | | | 1 year | | | | | | |
Shares issued under terms of the award | | | | | | | | | 24,210 | 14,616 | 30,672 | | | | |
Fair value of shares awarded | $ | | | | | | | | | $ 500,000 | $ 300,000 | $ 400,000 | | | | |
Cost of common stock issued from treasury | $ | | | | | | | | | $ 300,000 | 200,000 | 400,000 | | | | |
Weighted-average vesting period for recognition | | | | | | | | | 3 months | | | | | | |
Total recognized tax benefit from unvested stock awards | $ | | | | | | | | | $ 100,000 | 100,000 | 100,000 | | | | |
Intrinsic value of unvested stock awards | $ | | | | | | | | | | 400,000 | | | | | |
Share-based compensation expense | $ | | | | | | | | | $ 400,000 | $ 334,000 | $ 383,000 | | | | |
Client Partner And Consultant Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Number of additional individual vesting conditions | item | | | 0 | | | | | | | | | | | | |
Granted as fully vested shares | | | | | | | | | | | 2,000 | | | | |
Value of shares granted and fully vested | $ | | | $ 10,000 | | | | | | | | $ 15,000 | | | | |
Number of individuals who qualified for award | employee | | | | | | | | | 5 | 12 | 6 | | | | |
Threshold of cumulative sales over the career in order to receive common stock | $ | | | | | | | | | | | | | $ 20,000,000 | | |
Threshold of consulting days performed over the career in order to receive common stock | | | | | | | | | | | | | 1500 days | | |
2015 Plan [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Authorized additional shares of common stock for issuance | 1,000,000 | | | | | | | | | | | | | | |
Shares available for granting | | | 964,000 | | | | | | 964,000 | | | | | | 964,000 |
Shares remaining in employee stock purchase plan | | | 490,000 | | | | | | 490,000 | | | | | | 490,000 |
Employee Stock Purchase Plan [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Price of common stock as a percent of the average fair market value | | | | | | | | | 85.00% | | | | | | |
Shares issued to employee stock purchase plan participants | | | | | | | | | 42,687 | 36,761 | 45,845 | | | | |
Cost basis of shares issued to employee stock purchase plan participants | $ | | | | | | | | | $ 600,000 | $ 500,000 | $ 600,000 | | | | |
Proceeds from ESPP participants | $ | | | | | | | | | 700,000 | 600,000 | 500,000 | | | | |
Share-based compensation expense | $ | | | | | | | | | $ 121,000 | $ 113,000 | $ 92,000 | | | | |
Vesting Date 1 [Member] | Fiscal 2010 Long-Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting date | | | | | | | | | | | | | Aug. 31, 2012 | | |
Vesting date | | | | | | | | | | | | | Aug. 31, 2012 | | |
Vesting Date 2 [Member] | Fiscal 2010 Long-Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting date | | | | | | | | | | | | | Mar. 2, 2013 | | |
Vesting date | | | | | | | | | | | | | Mar. 2, 2013 | | |
Vesting Date 3 [Member] | Fiscal 2010 Long-Term Incentive Plan Award [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting date | | | | | | | | | | | | | Aug. 31, 2013 | | |
Vesting date | | | | | | | | | | | | | Aug. 31, 2013 | | |
Tranche One [Member] | Fiscal 2014 Grant 2 [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | $ 18.05 | | | | | | | | | | | | | |
Number of shares | | 9,557 | | | | | | | | | | | | | |
Tranche One [Member] | Stock Options [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Exercise price | $ / shares | | | | | | | | | | | | | $ 9 | 9 | |
Tranche Two [Member] | Fiscal 2014 Grant 2 [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Vesting price per share | $ / shares | | $ 22 | | | | | | | | | | | | | |
Number of shares | | 3,920 | | | | | | | | | | | | | |
Tranche Two [Member] | Stock Options [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Exercise price | $ / shares | | | | | | | | | | | | | 10 | 10 | |
Tranche Three [Member] | Stock Options [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Exercise price | $ / shares | | | | | | | | | | | | | 12 | 12 | |
Tranche Four [Member] | Stock Options [Member] | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | |
Exercise price | $ / shares | | | | | | | | | | | | | $ 14 | $ 14 | |