Investments (Equity Method Investee, Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Equity interests income (loss)	$ 1,908	$ 7,149	$ 12,754	$ 18,537
EPIX
Schedule of Equity Method Investments [Line Items]
Equity interests income (loss)	5,070	8,157	16,027	21,229
Pop
Schedule of Equity Method Investments [Line Items]
Equity interests income (loss)	(2,388)	1,032	(2,074)	665
Other
Schedule of Equity Method Investments [Line Items]
Equity interests income (loss)	$ (774)	$ (2,040)	$ (1,199)	$ (3,357)