For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Segment Information (Narrative) (Details)	12 Months Ended
Segment Information (Narrative) (Details)	Jun. 30, 2020 Customer Fullpowertvstation Duopoly	Jun. 30, 2019 Customer	Jun. 30, 2018 Customer
Customer Concentration Risk \| Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Number of major customers \| Customer	0	1	1
Concentration Risk, Percentage		11.00%	10.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Minimum
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.00%
Television Segment \| US
Segment Reporting Information [Line Items]
Full power broadcast television stations	29
Duopolies \| Duopoly	11
FOX Network \| Television Segment \| US
Segment Reporting Information [Line Items]
Full power broadcast television stations	18
MyNetworkTV \| Television Segment \| US
Segment Reporting Information [Line Items]
Full power broadcast television stations	10
Independent Station \| Television Segment \| US
Segment Reporting Information [Line Items]
Full power broadcast television stations	1