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Summary of Significant Accounting Policies - GNU Interest (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 18, 2018 | May 03, 2017 | Apr. 13, 2016 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Jul. 02, 2016 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 108,763 | $ 103,871 | $ 105,538 | $ 99,476 | $ 97,016 | $ 91,325 | $ 93,563 | $ 88,171 |  | $ 417,648 | $ 370,075 | $ 324,779
Net income |  |  |  | $ 6,839 | $ 3,908 | $ 6,839 | $ 4,886 | $ (2,261) | $ 3,225 | 3,907 | $ 2,830 |  | 22,472 | 7,701 | 14,233
Net income (loss), net of amounts allocable to its other owners |  |  |  |  |  |  |  |  |  |  |  |  | 22,384 | 7,573 | 12,793
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price received |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 | 1,100
GNU gain on sale of business assets |  |  |  |  |  |  |  |  |  |  |  |  | 258 | 250 | 3,836
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price received |  | $ 300 | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |
GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by the entity | 55.89% |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 800
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 | 3,000
Net income (loss), net of amounts allocable to its other owners |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 1,700
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU gain on sale of business assets |  |  |  |  |  |  |  |  |  | 300 |  | $ 3,800 | 300 |  |
GNU partial distribution gain received on sale of business assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |
CRA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU gain on sale of business assets |  |  |  |  |  |  |  |  |  | $ 200 |  | $ 2,100 |  |  |

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