Financial Information about Industry Segments (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2017 USD ($) measure segment	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Number of principal financial measures | measure	2
Total revenues	$ 392,771	$ 399,879
Income from operations	56,798	60,762
Interest expense, net	(5,078)	(4,749)
Earnings before income taxes	51,720	56,013
Depreciation and amortization	12,550	13,896
National media [Member]
Segment Reporting Information [Line Items]
Total revenues	238,960	247,293
Income from operations	28,256	24,111
Depreciation and amortization	3,987	4,518
Local media [Member]
Segment Reporting Information [Line Items]
Total revenues	153,811	152,586
Income from operations	40,942	50,622
Depreciation and amortization	7,938	8,990
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	(12,400)	(13,971)
Depreciation and amortization	$ 625	$ 388