Amount of damages awarded to the plaintiff in the legal matter.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments and Contingencies (Details) $ in Millions			1 Months Ended	12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Mar. 28, 2019 USD ($)	Oct. 15, 2018 USD ($)	Sep. 30, 2015 store	Dec. 31, 2018 memeber	Mar. 31, 2019 store
Loss Contingencies [Line Items]
Guarantor Obligations, Number of Leases					80
Loss Contingency, Number Of Locations With Subpoena For Documents			8
Loss Contingency, Audit Methodology Sample Size \| memeber				200
Provider Proceedings [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value \| $	$ 86	$ 150