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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 02, 2015 | May. 31, 2013 | Jul. 18, 2015 | Jan. 02, 2016 | Jan. 03, 2015
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 |  |  |
Deferred and restricted stock | Retainer Conversion |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Retainers conversion into deferred shares |  |  |  | 130.00% |
Deferred shares distributed |  |  |  | 0 |
Aggregate shares converted | 19,852 |  |  |  |
Deferred Stock | Distributed to director who retired on May 21, 2014 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred shares distributed |  |  |  |  | 105,621
Deferred Stock | Distributed to director who retired on December 31, 2014 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred shares distributed |  |  |  |  | 46,364
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 29 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 EPIP |  |  |  | $ 1.1 |
Expected weighted-average period to recognize compensation cost (years) |  |  |  | 10 months 2 days |
Total fair value of shares vested |  |  |  | $ 2.2 |
Award vesting tax windfall |  |  |  | $ 0.1 |
Omnibus Plan | Deferred and restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Retainers conversion into deferred shares |  |  |  | 100.00% |
Vesting period |  |  |  | 1 year |
Annual Grant Awards | Deferred and restricted stock | Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate shares converted |  |  | 69,582 |  |
Annual Grant Awards | Deferred Stock | Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred shares distributed |  |  |  | 55,713 |
Minimum | Deferred and restricted stock | Retainer Conversion |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 2 years |
Minimum | Annual Grant Awards | Deferred and restricted stock | Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 1 year |

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