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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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