Derivative Instruments and Hedging Activities (Details) - USD ($)		1 Months Ended	12 Months Ended
	Jul. 02, 2014	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Jun. 27, 2014	May. 15, 2013
Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in Other Comprehensive Income on derivatives (effective portion)			$ (453,000)	$ 2,388,000	$ 0
Designated as Hedging Instrument [Member] | Foreign currency forward [Member] | Interest expense (income), net / Other income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain on derivatives reclassified into Income from Accumulated Other Comprehensive Income (effective portion)			(49,000)	2,536,000	0
Non-designated derivatives [Member] | Convertible Notes Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, net asset (liability) of derivative instruments			0	0	0
Non-designated derivatives [Member] | Foreign currency forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, net asset (liability) of derivative instruments			1,152,000	0	0
Non-designated derivatives [Member] | Foreign currency forward [Member] | Other income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of unrealized gain			1,152,000	0	0
Other assets, net [Member] | Convertible notes hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			37,000,000
Other assets, net [Member] | Non-designated derivatives [Member] | Convertible notes hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			36,994,000	0	0
Long-term debt, less current maturities [Member] | Convertible notes embedded derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, (liabilities) of derivative instruments		$ (46,500,000)
Long-term debt, less current maturities [Member] | Non-designated derivatives [Member] | Convertible notes embedded derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, (liabilities) of derivative instruments			(36,994,000)	0	0
Prepaid expenses and other assets [Member] | Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			2,420,000	1,813,000
Prepaid expenses and other assets [Member] | Non-designated derivatives [Member] | Foreign currency forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			$ 1,152,000	$ 0	$ 0
9% unsecured notes due 2015 [Member] | Grupo Finmart [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cross-border debt offering							$ 30,000,000
Convertible Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Convertible senior notes issued and settled	$ 30,000,000	200,000,000.0
Option to purchase additional principal		$ 30,000,000				$ 30,000,000