Income Taxes (Narrative) (Details) - USD ($)			3 Months Ended	12 Months Ended
	Jul. 01, 2017	May 31, 2017	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
U.S. statutory tax rate				28.10%	35.00%	35.00%
Tax cuts and jobs act of 2017, change in tax rate, provisional income tax expense (benefit)			$ (133,000,000)
Excess tax benefit	$ 2,200,000
Effective income tax rate				1282.40%	34.90%	69.20%
Tax rate reconciliation, tax settlement				$ 6,700,000
Goodwill, impairment loss				54,900,000
Percentage of goodwill impairment that is tax deductible						20.00%
Capital loss carryforwards				251,400,000
Unrecognized tax benefits that, if recognized, would impact effective tax rate				49,700,000	$ 18,200,000
Unrecognized tax benefits, accrued interest and penalties				8,400,000	6,000,000
Increase in valuation allowance				21,100,000
Increase in positions acquired in business combination				31,900,000	$ 0
Minimum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefits				24,500,000
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefits				6,700,000
MXM
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Goodwill, impairment loss		$ 0
MXM | Impairment of goodwill and other long-lived assets
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Goodwill, impairment loss						$ 116,900,000
Time, Inc.
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Tax liability recorded in connection with the TMA				26,000,000
Federal
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforwards				102,400,000
State
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforwards				$ 137,200,000