Derivative Instruments and Hedging Activities (Details) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 02, 2014	Jun. 30, 2014	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Jun. 27, 2014	Jun. 30, 2013	May. 15, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds from settlement of foreign currency forwards attributable to the repaid cross-border debt				$ 2,313,000	$ 0	$ 0
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)				0	(453,000)	2,388,000
Designated as hedging instrument [Member] | Foreign currency forward [Member] | Other expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss (gain) on derivatives reclassified into Income from Accumulated Other Comprehensive Income (effective portion)				(457,000)	49,000	(2,536,000)
Non-designated derivatives [Member] | Foreign currency forward [Member] | Other expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of unrealized gain				9,529,000	1,152,000	$ 0
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				10,681,000	1,152,000
Other assets, net [Member] | Non-designated derivatives [Member] | Convertible notes hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments				10,505,000	36,994,000
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				$ (10,505,000)	$ (36,994,000)
Grupo Finmart [Member] | Foreign currency forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds from settlement of foreign currency forwards attributable to the repaid cross-border debt			$ 2,300,000
8.5% unsecured notes due 2015 [Member] | Grupo Finmart [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cross-border debt offering								$ 30,000,000	$ 30,000,000.0
Convertible Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Convertible senior notes issued and settled	$ 30,000,000	200,000,000
Option to purchase additional principal		$ 30,000,000					$ 30,000,000