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Stock-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |  |  |
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Oct. 18, 2019 item shares | Jan. 25, 2019 USD ($) $ / shares shares | Oct. 01, 2018 item shares | Nov. 14, 2017 item shares | Aug. 31, 2020 USD ($) item employee shares | Aug. 31, 2019 USD ($) employee shares | Aug. 31, 2018 USD ($) employee shares | Oct. 18, 2016 item shares | Nov. 12, 2015 item shares | Aug. 31, 2015 item shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued from treasury stock |  |  |  |  | 311,452 |  |  |  |  |
Capitalized stock-based compensation expense | $ |  |  |  |  | $ 0 |  |  |  |  |
Income tax benefit from exercise of stock option | $ |  |  |  |  | $ 1,800 |  |  |  |  |
Number of shares withheld for statutory income taxes |  |  |  |  | 109,896 |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares withheld for tax |  |  |  |  | 102,656 |  |  |  |  |
Shares withheld for tax, value | $ |  |  |  |  | $ 3,600 |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  |  | $ 0 |  |  |  |  |
Stock options exercised |  |  |  |  | 350,000 |  |  |  |  |
Aggregate intrinsic value | $ |  |  |  |  | $ 8,000 |  |  |  |  |
Income tax benefit from exercise of stock option | $ |  |  |  |  | $ 1,800 |  |  |  |  |
Fiscal 2020 Long Term Incentive Plan Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
New shares granted | 25,101 |  |  |  |  |  |  |  |  |
Shares authorized to be issued | 150,630 |  |  |  |  |  |  |  |  |
Number of tranches | item | 3 |  |  |  |  |  |  |  |  |
Life of awards | 3 years |  |  |  |  |  |  |  |  |
Expiration date | Aug. 31, 2022 |  |  |  |  |  |  |  |  |
Percent of shares plan participants are entitled to | 25.00% |  |  |  |  |  |  |  |  |
Vesting period of awards | 3 years |  |  |  |  |  |  |  |  |
Fiscal 2019 Long Term Incentive Plan Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
New shares granted |  |  | 36,470 |  |  |  |  |  |  |
Shares authorized to be issued |  |  | 218,818 |  |  |  |  |  |  |
Shares vested |  |  |  |  | 0 | 0 |  |  |  |
Number of tranches | item |  |  | 3 |  |  |  |  |  |  |
Life of awards |  |  | 3 years |  |  |  |  |  |  |
Expiration date |  |  | Aug. 31, 2021 |  |  |  |  |  |  |
Percent of shares plan participants are entitled to |  |  | 25.00% |  |  |  |  |  |  |
Vesting period of awards |  |  | 3 years |  |  |  |  |  |  |
Fiscal 2018 Long Term Incentive Plan Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued |  |  |  | 257,300 |  |  |  |  |  |
Shares earned by participants |  |  |  |  | 221,067 |  |  |  |  |
Number of tranches | item |  |  |  | 3 |  |  |  |  |  |
Life of awards |  |  |  | 3 years |  |  |  |  |  |
Fiscal 2017 Long Term Incentive Plan Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued |  |  |  |  |  |  |  | 183,381 |  |
Number of individual vesting conditions | item |  |  |  |  |  |  |  | 6 |  |
Number of performance measures | item |  |  |  |  |  |  |  | 2 |  |
Shares vested |  |  |  |  | 97,803 |  |  |  |  |
Number of tranches | item |  |  |  |  | 4 |  |  |  |  |
Life of awards |  |  |  |  | 6 years |  |  |  |  |
Expiration date |  |  |  |  | Aug. 31, 2022 |  |  |  |  |
Fiscal 2016 Long Term Incentive Plan Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued |  |  |  |  |  |  |  |  | 231,276 |
Number of individual vesting conditions | item |  |  |  |  |  |  |  |  | 6 |
Number of performance measures | item |  |  |  |  |  |  |  |  | 2 |
Shares vested |  |  |  |  | 123,348 |  |  |  |  |
Number of tranches | item |  |  |  |  | 4 |  |  |  |  |
Life of awards |  |  |  |  | 6 years |  |  |  |  |
Expiration date |  |  |  |  | Aug. 31, 2021 |  |  |  |  |
Fiscal 2015 Executive Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued |  |  |  |  |  |  |  |  |  | 112,464
Number of individual vesting conditions | item |  |  |  |  |  |  |  |  |  | 6
Number of performance measures | item |  |  |  |  |  |  |  |  |  | 2
Shares vested |  |  |  |  | 59,980 |  |  |  |  |
Number of tranches | item |  |  |  |  | 4 |  |  |  |  |
Life of awards |  |  |  |  | 6 years |  |  |  |  |
Expiration date |  |  |  |  | Aug. 31, 2020 |  |  |  |  |
Shares expired unvested |  |  |  |  | 52,484 |  |  |  |  |
Fiscal 2019 Time Based Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Price per share | $ / shares |  | $ 24.54 |  |  |  |  |  |  |  |
Vesting period of awards |  | 2 years |  |  |  |  |  |  |  |
Shares issued under terms of the award |  | 11,915 |  |  |  |  |  |  |  |
Fair value of shares awarded | $ |  | $ 300 |  |  |  |  |  |  |  |
Omnibus Incentive Plan 2019 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized additional shares of common stock for issuance |  | 700,000 |  |  |  |  |  |  |  |
Shares available for future grants |  |  |  |  | 511,000 |  |  |  |  |
Restricted Stock Awards [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  |  | $ 200 |  |  |  |  |
Whole-share grant per eligible director | $ |  |  |  |  | $ 100 |  |  |  |  |
Vesting period of awards |  |  |  |  | 1 year |  |  |  |  |
Cost of common stock issued from treasury | $ |  |  |  |  | $ 300 | $ 400 | $ 300 |  |  |
Weighted-average vesting period for recognition |  |  |  |  | 4 months |  |  |  |  |
Total recognized tax benefit from unvested stock awards | $ |  |  |  |  | $ 200 | $ 200 | $ 200 |  |  |
Intrinsic value of unvested stock awards | $ |  |  |  |  | $ 400 |  |  |  |  |
Restricted Stock Awards [Member] | Board Of Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued under terms of the award |  |  |  |  | 21,420 | 28,525 | 23,338 |  |  |
Fair value of shares awarded | $ |  |  |  |  | $ 700 | $ 700 | $ 700 |  |  |
2017 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available for purchase in employee stock purchase plan |  |  |  |  | 862,000 |  |  |  |  |
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 purchased by employee stock purchase plan participants |  |  |  |  | 41,409 | 43,073 | 40,941 |  |  |
Cost basis of shares issued to employee stock purchase plan participants | $ |  |  |  |  | $ 600 | $ 600 | $ 600 |  |  |
Proceeds from ESPP participants | $ |  |  |  |  | $ 1,000 | $ 1,000 | $ 800 |  |  |
Fully Vested Stock Awards [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of individuals who qualified for award | employee |  |  |  |  | 4 | 4 | 1 |  |  |
Tranche One [Member] | Fiscal 2018 Long Term Incentive Plan Award [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
New shares granted |  |  |  | 42,883 |  |  |  |  |  |
Percent of shares plan participants are entitled to |  |  |  | 25.00% |  |  |  |  |  |
Vesting period of awards |  |  |  | 3 years |  |  |  |  |  |
Tranche Two And Three [Member] | Fiscal 2020 Long Term Incentive Plan Award [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of performance award to be granted | 50.00% |  |  |  |  |  |  |  |  |
Tranche Two And Three [Member] | Fiscal 2020 Long Term Incentive Plan Award [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of performance award to be granted | 200.00% |  |  |  |  |  |  |  |  |
Tranche Two And Three [Member] | Fiscal 2019 Long Term Incentive Plan Award [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of performance award to be granted |  |  | 50.00% |  |  |  |  |  |  |
Tranche Two And Three [Member] | Fiscal 2019 Long Term Incentive Plan Award [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of performance award to be granted |  |  | 200.00% |  |  |  |  |  |  |
Tranche Two And Three [Member] | Fiscal 2018 Long Term Incentive Plan Award [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of performance award to be granted |  |  |  | 50.00% |  |  |  |  |  |
Tranche Two And Three [Member] | Fiscal 2018 Long Term Incentive Plan Award [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of performance award to be granted |  |  |  | 200.00% |  |  |  |  |  |

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