Distributions of Available Cash - Quarterly Distributions Per Common Unit Declared and Paid (Details) - $ / shares	3 Months Ended
Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jun. 24, 2017	Mar. 25, 2017	Dec. 24, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015
Distributions Made To Members Or Limited Partners [Abstract]
Distributions paid (in dollars per unit)	$ 0.6000	$ 0.6000	$ 0.6000	$ 0.6000	$ 0.6000	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875
Distributions declared (in dollars per unit)	$ 0.6000	$ 0.6000	$ 0.6000	$ 0.6000	$ 0.6000	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875	$ 0.8875

Per unit of ownership amount of cash distributions paid to unit-holder of a limited liability company (LLC).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Name:	us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration