Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			$ 2,092
Contingent consideration	(1,853)	(2,025)	(16,120)
Net financial assets (liabilities)	3,481	2,855	(12,076)
Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			2,092
Contingent consideration	0	0	0
Net financial assets (liabilities)	0	0	2,092
Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			0
Contingent consideration	0	0	0
Net financial assets (liabilities)	5,334	4,880	1,952
Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			0
Contingent consideration	(1,853)	(2,025)	(16,120)
Net financial assets (liabilities)	(1,853)	(2,025)	(16,120)
Foreign currency forward [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	9,987	3,572	1,952
Derivative liability	(4,653)	1,308
Foreign currency forward [Member] | Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0	0
Derivative liability	0	0
Foreign currency forward [Member] | Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	9,987	3,572	1,952
Derivative liability	(4,653)	1,308
Foreign currency forward [Member] | Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0	0
Derivative liability	0	0
Convertible notes hedges [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	45,163	36,994
Convertible notes hedges [Member] | Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0
Convertible notes hedges [Member] | Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	45,163	36,994
Convertible notes hedges [Member] | Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0
Convertible notes embedded derivative [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	(45,163)	(36,994)
Convertible notes embedded derivative [Member] | Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	0	0
Convertible notes embedded derivative [Member] | Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	(45,163)	(36,994)
Convertible notes embedded derivative [Member] | Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	$ 0	$ 0