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Stock-Based Compensation Plans (Narrative) (Details) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 12, 2016 USD ($) employees $ / shares shares | Oct. 14, 2015 shares | Oct. 15, 2014 shares | Aug. 26, 2017 USD ($) | Aug. 27, 2016 USD ($) plans shares | Aug. 29, 2015 USD ($) shares | Aug. 30, 2014 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 3,293,000 | $ 3,097,000 | $ 3,386,000
Weighted average remaining contractual life for outstanding options |  |  |  |  | 9 years 4 months 24 days |  |
Aggregate intrinsic value of options outstanding |  |  |  |  | $ 72,000 |  |
Unrecognized compensation expense related to stock options |  |  |  |  | $ 42,000 |  |
Options granted, shares | shares |  |  |  |  | 10,000 | 0 | 0
Aggregate intrinsic value of awards outstanding |  |  |  |  | $ 6,800,000 |  |
Unrecognized compensation expense related to restricted stock awards |  |  |  |  | 2,800,000 |  |
Total fair value of awards vested |  |  |  |  | 2,200,000 | $ 4,200,000 | $ 3,600,000
Employee Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 11,000 | $ 0 | $ 0
Unrecognized compensation expense, period of recognition |  |  |  |  | 2 years 4 months 24 days |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense, period of recognition |  |  |  |  | 1 year 10 months 24 days |  |
Annual Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual incentive plan, portion paid in cash |  |  |  |  | 0.667 | 0.667 | 0.667
Annual incentive plan, portion paid in restricted stock |  |  |  |  | 0.333 | 0.333 | 0.333
Stock-based compensation expense |  |  |  |  | $ 1,467,000 | $ 454,000 | $ 2,600,000
Annual Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted | shares |  | 7,914 | 40,495 |  |  |  |
Long-Term Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 318,000 | $ 360,000 | $ 540,000
Long-Term Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Term of award |  |  |  |  | 3 years |  |
Number of plans established | plans |  |  |  |  | 3 |  |
Term of sale restriction period after grant |  |  |  |  | 1 year |  |
Shares granted | shares |  | 18,156 | 25,529 |  |  |  |
2014 Incentive Compensation Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized | shares |  |  |  |  | 3,600,000 |  |
2014 Incentive Compensation Plan [Member] | Awards Excluding Stock Options and Stock Appreciation Rights [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized | shares |  |  |  |  | 3,600,000 |  |
2014 Incentive Compensation Plan [Member] | Employee Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Term of award |  |  |  |  | 10 years |  |
2014 Incentive Compensation Plan [Member] | Non-time-based Awards [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |
2014 Incentive Compensation Plan [Member] | Non-time-based Awards [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 1 year |  |
2014 Incentive Compensation Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Requisite service period |  |  |  |  | 3 years |  |
Directors [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of stock to directors (in shares) | shares |  |  |  |  | 5,058 |  |
Aggregate intrinsic value of awards outstanding (in shares) | shares |  |  |  |  | 86,506 |  |
Aggregate intrinsic value of awards outstanding |  |  |  |  | $ 2,100,000 |  |
Directors [Member] | 2004 Incentive Compensation Plans [Member] | Employee Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 6 months |  |
Key Management [Member] | 2014 Incentive Compensation Plan [Member] | Employee Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |
Vesting initiation period from grant date |  |  |  |  | 1 year |  |
Subsequent Event [Member] | Annual Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted | shares | 17,532 |  |  |  |  |  |
Subsequent Event [Member] | Long-Term Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted | shares | 11,419 |  |  |  |  |  |
Subsequent Event [Member] | 2014 Incentive Compensation Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Closing price of common stock on grant date | $ / shares | $ 27.89 |  |  |  |  |  |
Subsequent Event [Member] | Officers [Member] | 2014 Incentive Compensation Plan [Member] | Employee Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted, shares | shares | 46,800 |  |  |  |  |  |
Subsequent Event [Member] | Key Management [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of Key Management employees | employees | 60 |  |  |  |  |  |
Subsequent Event [Member] | Key Management [Member] | 2014 Incentive Compensation Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted | shares | 76,800 |  |  |  |  |  |
Shares granted, value | $ 2,100,000 |  |  |  |  |  |
Subsequent Event [Member] | Non-Management Board Members [Member] | 2014 Incentive Compensation Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted | shares | 20,800 |  |  |  |  |  |
Shares granted, value | $ 580,000 |  |  |  |  |  |
Subsequent Event [Member] | Forecasted stock-based comp expense [Member] | 2014 Incentive Compensation Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 1,000,000 |  |  |

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