Share-Based Compensation - Weighted-average assumptions using Black-Scholes model (Details)	3 Months Ended
Sep. 30, 2017 $ / shares
Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan \| PNQs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value (in US$ per share)	$ 0.00

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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