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Stock-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 15, 2018 USD ($) employees $ / shares shares | Oct. 12, 2016 shares | Aug. 31, 2019 USD ($) | Aug. 25, 2018 USD ($) shares | Aug. 26, 2017 USD ($) shares | Aug. 27, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Accrued compensation |  |  |  | $ 29,350 | $ 24,546 |
Options granted, shares | shares |  |  |  | 72,710 | 63,800 | 10,000
2014 Incentive Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | shares |  |  |  | 3,600,000 |  |
Awards Excluding Stock Options and Stock Appreciation Rights [Member] | Maximum [Member] | 2014 Incentive Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | shares |  |  |  | 3,600,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date |  |  |  | 15.00% |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares |  |  |  | 2,760 |  |
Accrued compensation |  |  |  | $ 100 |  |
Term of sale restriction period after grant |  |  |  | 1 year |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | shares |  |  |  | 167,781 | 156,801 | 240,270
Aggregate intrinsic value of awards outstanding |  |  |  | $ 10,600 |  |
Unrecognized compensation expense related to restricted stock awards |  |  |  | $ 5,600 |  |
Unrecognized compensation expense, period of recognition |  |  |  | 1 year 2 months |  |
Total fair value of awards vested |  |  |  | $ 7,100 | $ 4,900 | $ 2,200
Restricted Stock [Member] | Long-Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Term of award |  |  |  | 3 years |  |
Term of sale restriction period after grant |  |  |  | 1 year |  |
Restricted Stock [Member] | Performance-based annual plan employee award [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | shares |  | 17,532 |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Closing price of common stock on grant date | $ / shares | $ 31.70 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Subsequent Event [Member] | Forecasted stock-based comp expense [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 1,600 |  |  |
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Key Management [Member] | Subsequent Event [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | shares | 77,869 |  |  |  |  |
Shares granted, value | $ 2,500 |  |  |  |  |
Number of Key Management employees | employees | 40 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Non Management Board Members [Member] | Subsequent Event [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | shares | 23,975 |  |  |  |  |
Shares granted, value | $ 800 |  |  |  |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate intrinsic value of options outstanding |  |  |  | $ 600 |  |
Unrecognized compensation expense related to stock options |  |  |  | $ 1,000 |  |
Unrecognized compensation expense, period of recognition |  |  |  | 1 year 9 months |  |
Weighted average remaining contractual life for outstanding options |  |  |  | 8 years 7 months |  |
Stock options | 2014 Incentive Compensation Plan [Member] | Officers [Member] | Subsequent Event [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options granted, shares | shares | 114,635 |  |  |  |  |

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