GOODWILL AND RADIO BROADCASTING LICENSES: (Details Textual) (Income Approach Valuation Technique [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013
Income Approach Valuation Technique [Member]
Schedule Of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Pre Tax Impairment Charges	$ 0	[1]	$ 3.7	[1]	$ 9.8	$ 1.4

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