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Leases	9 Months Ended
	Sep. 30, 2017
Leases [Abstract]
Leases	5. Leases  On September 18, 2017, Medifast announced the relocation of its corporate offices to 100 International Drive Baltimore, Maryland.  As part of this move, Medifast incurred an operating lease with future minimum lease payments totaling $8.8 million to be recognized during the period of August 30, 2017 through February 27, 2026. 

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No definition available.

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- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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-Topic 840
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694

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-Publisher FASB
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-Topic 840
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-Section 55
-Paragraph 40
-Subparagraph (Note 1,3)
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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