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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended
--- | --- | ---
May 31, 2013 | Oct. 08, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period |  | 1 year
Chief Executive Officer |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock award | $ 1.3 |
Restricted shares issued | 58,500 |
Restricted Stock Award |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected weighted-average period to recognize compensation cost (years) |  | 1 year 2 months 5 days
Restricted Stock Award | Chief Executive Officer |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted shares per share | $ 22.25 |
Deferred Stock Activity |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost related to nonvested restricted stock granted by the Omnibus Plan |  | $ 1.2
Expected weighted-average period to recognize compensation cost (years) |  | 7 months 10 days
Deferred Stock Activity | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Intrinsic value of shares vested |  | $ 1.3
Omnibus Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Retainers conversion into deferred shares |  | 100.00%
Vesting period |  | 1 year
Annual Grants | Restricted And Deferred Stock | Non Employee Directors |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate shares deferred |  | 76,274
Annual Grants | Restricted And Deferred Stock | Non Employee Directors | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period |  | 1 year
Retainer Conversion |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Retainers conversion into deferred shares |  | 130.00%
Vesting period |  | 2 years
Director Retainer Deferrals | Omnibus Plan | Restricted And Deferred Stock | Non Employee Directors |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate shares deferred |  | 19,040

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