Goodwill And Intangible Assets (Schedule Of Indefinite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2011	Dec. 31, 2011	Jun. 30, 2011
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets		$ 158,096	$ 158,096
Impairment of indefinite-lived intangible assets	0
MSG Sports [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets		96,215	96,215
MSG Entertainment [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets		$ 61,881	$ 61,881