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Share-Based Compensation (Narrative) (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 USD ($) item shares | Aug. 31, 2018 USD ($) shares | Aug. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pre-tax total unrecognized compensation cost related to nonvested share-based compensation | $ | $ 6,300 |  |
Weighted average period to be recognized | 1 year 9 months 18 days |  |
Outstanding stock options vested | 15,496 | 27,811 | 25,285
Shares outstanding | 112,561 | 76,803 |
Allocated Share-based Compensation Expense | $ | $ 4,395 | $ 3,893 | $ 3,597
Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Percentage vested per year | 33.00% |  |
Fair value vested | $ | $ 4,100 | $ 3,200 |
Number of shares vested | 40,655 |  |
Restricted Stock Units Settled In Cash [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares outstanding | 4,103 | 6,474 | 6,709
Performance Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of shares vested | 0 | 0 | 0
Performance Stock Units [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of awards actually earned | 0.00% |  |
Performance Stock Units [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of awards actually earned | 200.00% |  |
Performance Stock Units [Member] | Defined Performance Goal Not Met [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Allocated Share-based Compensation Expense | $ | $ 0 |  |
2015 Long-Term Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Plan effective date | Jan. 26, 2015 |  |
Maximum number of shares authorized | 626,968 |  |
Number of shares available | 393,145 |  |
Stock award ratio | item | 1 |  |
2015 Long-Term Incentive Plan [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option expire, years | 10 years |  |
Vesting period | 4 years |  |
Percentage vested per year | 25.00% |  |
Non Employee Directors [Member] | Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 9 months |  |

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