GOODWILL AND RADIO BROADCASTING LICENSES: (Details) (Income Approach Valuation Technique [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Oct. 01, 2013	Jun. 30, 2013		Mar. 31, 2013
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Pre-tax impairment charge (in millions)	$ 0	[1]	$ 0	$ 9.8	[1]	$ 1.4
Discount Rate	9.50%	[1]	10.00%	10.50%	[1]
Year 1 Market Revenue Growth Rate Range				2.00%	[1]
Long-term Market Revenue Growth Rate Range (Years 6 - 10)	2.00%	[1]
Minimum [Member]
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Year 1 Market Revenue Growth Rate Range	1.50%	[1]	0.00%
Long-term Market Revenue Growth Rate Range (Years 6 - 10)			1.00%	1.50%	[1]
Mature Market Share Range	6.40%	[1]	6.40%	8.60%	[1]
Operating Profit Margin Range	34.80%	[1]	30.80%	32.60%	[1]
Maximum [Member]
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Year 1 Market Revenue Growth Rate Range	2.20%	[1]	2.00%
Long-term Market Revenue Growth Rate Range (Years 6 - 10)			2.00%	2.00%	[1]
Mature Market Share Range	26.90%	[1]	26.90%	15.10%	[1]
Operating Profit Margin Range	47.80%	[1]	47.80%	34.40%	[1]

[1] Reflects changes only to the key assumptions used in the interim testing for certain units of accounting.