Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015	Jun. 30, 2014
Not Designated as Hedging Instrument | Foreign currency forwards | Other expense
Derivative [Line Items]
Amount of unrealized gain (loss) on derivatives	$ (650)		$ 5,846	$ (3,568)	$ 7,710
Current and non-current assets held for sale | Not Designated as Hedging Instrument | Foreign currency forwards
Derivative [Line Items]
Fair value, asset of derivative instruments	7,044		11,273	7,044	11,273	$ 14,169
Other assets, net | Not Designated as Hedging Instrument | Cash Convertible Notes Hedges
Derivative [Line Items]
Fair value, asset of derivative instruments	16,200		23,160	16,200	23,160	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	$ (16,200)		$ (23,160)	$ (16,200)	$ (23,160)	$ (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%	8.50%	8.50%	8.50%