Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Proceeds from settlement of forward currency contracts	$ 3,557	$ 2,313
Not Designated as Hedging Instrument | Foreign currency forwards | Other expense
Derivative [Line Items]
Amount of unrealized gain (loss) on derivatives	(1,113)	7,014
Receivables, prepaid expenses and other current assets | Not Designated as Hedging Instrument | Foreign currency forwards
Derivative [Line Items]
Fair value, asset of derivative instruments	9,499	9,987	$ 14,169
Other assets, net | Not Designated as Hedging Instrument | Cash Convertible Notes Hedges
Derivative [Line Items]
Fair value, asset of derivative instruments	7,777	45,163	10,505
Long-term debt, less current maturities | Cash Convertible Notes Embedded Derivative
Derivative [Line Items]
Fair value, (liabilities) of derivative instruments				$ (46,500)
Long-term debt, less current maturities | Not Designated as Hedging Instrument | Cash Convertible Notes Embedded Derivative
Derivative [Line Items]
Fair value, (liabilities) of derivative instruments	(7,777)	$ (45,163)	$ (10,505)
8.5% Unsecured notes due 2015
Derivative [Line Items]
Proceeds from settlement of forward currency contracts	$ 3,600
Non Recourse Debt | 8.5% Unsecured notes due 2015
Derivative [Line Items]
Stated interest rate	8.50%	8.50%	8.50%