Derivative Instruments and Hedging Activities (Details) (USD $)	12 Months Ended												12 Months Ended																				0 Months Ended	1 Months Ended
	Sep. 30, 2014 Designated as Hedging Instrument [Member] Foreign currency forward [Member]	Sep. 30, 2013 Designated as Hedging Instrument [Member] Foreign currency forward [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Foreign currency forward [Member]	Sep. 30, 2014 Designated as Hedging Instrument [Member] Foreign currency forward [Member] Interest expense (income), net / Other income [Member]	Sep. 30, 2013 Designated as Hedging Instrument [Member] Foreign currency forward [Member] Interest expense (income), net / Other income [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Foreign currency forward [Member] Interest expense (income), net / Other income [Member]	Sep. 30, 2014 Non-designated derivatives [Member] Convertible Notes Derivatives [Member]	Sep. 30, 2013 Non-designated derivatives [Member] Convertible Notes Derivatives [Member]	Sep. 30, 2012 Non-designated derivatives [Member] Convertible Notes Derivatives [Member]	Sep. 30, 2014 Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2013 Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2012 Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2014 Non-designated derivatives [Member] Foreign currency forward [Member] Other income [Member]	Sep. 30, 2013 Non-designated derivatives [Member] Foreign currency forward [Member] Other income [Member]	Sep. 30, 2012 Non-designated derivatives [Member] Foreign currency forward [Member] Other income [Member]	Sep. 30, 2014 Other assets, net [Member] Convertible notes hedges [Member]	Sep. 30, 2014 Other assets, net [Member] Non-designated derivatives [Member] Convertible notes hedges [Member]	Sep. 30, 2013 Other assets, net [Member] Non-designated derivatives [Member] Convertible notes hedges [Member]	Sep. 30, 2012 Other assets, net [Member] Non-designated derivatives [Member] Convertible notes hedges [Member]	Jun. 30, 2014 Long-term debt, less current maturities [Member] Convertible notes embedded derivative [Member]	Sep. 30, 2014 Long-term debt, less current maturities [Member] Non-designated derivatives [Member] Convertible notes embedded derivative [Member]	Sep. 30, 2013 Long-term debt, less current maturities [Member] Non-designated derivatives [Member] Convertible notes embedded derivative [Member]	Sep. 30, 2012 Long-term debt, less current maturities [Member] Non-designated derivatives [Member] Convertible notes embedded derivative [Member]	Sep. 30, 2014 Prepaid expenses and other assets [Member] Designated as Hedging Instrument [Member] Foreign currency forward [Member]	Sep. 30, 2013 Prepaid expenses and other assets [Member] Designated as Hedging Instrument [Member] Foreign currency forward [Member]	Sep. 30, 2014 Prepaid expenses and other assets [Member] Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2013 Prepaid expenses and other assets [Member] Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2012 Prepaid expenses and other assets [Member] Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2014 Other current liabilities [Member] Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2013 Other current liabilities [Member] Non-designated derivatives [Member] Foreign currency forward [Member]	Sep. 30, 2012 Other current liabilities [Member] Non-designated derivatives [Member] Foreign currency forward [Member]	May 15, 2013 9% unsecured notes due 2015 [Member] Grupo Finmart [Member]	Jul. 02, 2014 Convertible Senior Notes [Member]	Jun. 30, 2014 Convertible Senior Notes [Member]	Jun. 27, 2014 Convertible Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cross-border debt offering																																$ 30,000,000
Convertible senior notes issued and settled																																	30,000,000	200,000,000.0
Option to purchase additional principal																																		30,000,000	30,000,000
Fair value, asset of derivative instruments																37,000,000	36,994,000	0	0					2,420,000	1,813,000	1,152,000	0	0
Fair value, (liabilities) of derivative instruments																				(46,500,000)	(36,994,000)	0	0						1,308,000	0	0
Fair value, net asset (liability) of derivative instruments							0	0	0	2,460,000	0	0
Amount of (loss) gain recognized in Other Comprehensive Income on derivatives (effective portion)	(453,000)	2,388,000	0
Amount of (loss) gain on derivatives reclassified into Income from Accumulated Other Comprehensive Income (effective portion)				(49,000)	2,536,000	0
Amount of unrealized gain													$ 2,460,000	$ 0	$ 0