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Summary of Significant Accounting Policies - GNU Interest (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 03, 2017 | Apr. 13, 2016 | Jan. 08, 2015 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Apr. 04, 2015 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of note payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 | $ 300
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 606
Net revenue |  |  |  | $ 97,016 | $ 91,325 | $ 93,563 | $ 88,171 | $ 79,569 | $ 81,691 | $ 82,607 | $ 80,912 |  |  | $ 370,075 | 324,779 | 303,559
Net income |  |  |  | $ (2,261) | $ 3,225 | 3,907 | $ 2,830 | $ 2,076 | $ 3,151 | 6,767 | $ 2,239 |  |  | 7,701 | 14,233 | 6,325
Net income (loss), net of amounts allocable to its other owners |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,573 | 12,793 | 7,598
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price received |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 | 1,100 |
GNU gain on sale of business assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250 | 3,836 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 1,350 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price received | $ 250 | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU gain on sale of business assets |  |  |  |  |  |  |  |  |  | 2,100 |  |  |  |  |  |
GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by the entity |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.89% |  |
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU gain on sale of business assets |  |  |  |  |  | 250 |  |  |  | $ 3,800 |  |  |  |  |  |
CRA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU gain on sale of business assets |  |  |  |  |  | $ 140 |  |  |  |  |  |  |  |  |  |
GNU gain received on sale of business assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |
GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note payable |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of note payable |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |
Net revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800 | 3,800
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 | 3,000 | (3,000)
Net income (loss), net of amounts allocable to its other owners |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 1,700 | $ 1,300
Goodwill and intangible asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | $ 4,500 |  |  |  |

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