Derivative Instruments and Hedging Activities (Details) - USD ($)		1 Months Ended	3 Months Ended			9 Months Ended
	Jul. 02, 2014	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014	Jun. 30, 2013	May. 15, 2013
Derivative [Line Items]
Proceeds from settlement of forward currency contracts						$ 2,313,000	$ 0
Foreign currency forward [Member]
Derivative [Line Items]
Proceeds from settlement of forward currency contracts				$ 2,300,000
Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative [Line Items]
Amount of loss recognized in other comprehensive income on derivatives			$ 0		$ 497,000	0	1,169,000
Designated as Hedging Instrument [Member] | Foreign currency forward [Member] | Other expense [Member]
Derivative [Line Items]
Amount of loss on derivatives reclassified into income from accumulated other comprehensive income			35,000		272,000	422,000	814,000
Not Designated as Hedging Instrument [Member] | Foreign currency forward [Member] | Other expense [Member]
Derivative [Line Items]
Amount of unrealized gain (loss) on derivatives			5,811,000		289,000	7,288,000	289,000
Receivables, prepaid expenses and other current assets [Member] | Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative [Line Items]
Fair value, asset of derivative instruments		$ 1,496,000	2,833,000		1,496,000	2,833,000	1,496,000	$ 2,420,000
Receivables, prepaid expenses and other current assets [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency forward [Member]
Derivative [Line Items]
Fair value, asset of derivative instruments		0	8,440,000		0	8,440,000	0	1,152,000
Other assets, net [Member] | Not Designated as Hedging Instrument [Member] | Convertible notes hedges [Member]
Derivative [Line Items]
Fair value, asset of derivative instruments		46,454,000	23,160,000		46,454,000	23,160,000	46,454,000	36,994,000
Long-term debt, less current maturities [Member] | Convertible notes embedded derivative [Member]
Derivative [Line Items]
Fair value, (liabilities) of derivative instruments		(46,500,000)			(46,500,000)		(46,500,000)
Long-term debt, less current maturities [Member] | Not Designated as Hedging Instrument [Member] | Convertible notes embedded derivative [Member]
Derivative [Line Items]
Fair value, (liabilities) of derivative instruments		(46,454,000)	$ (23,160,000)		(46,454,000)	$ (23,160,000)	(46,454,000)	$ (36,994,000)
9% unsecured notes due 2015 [Member] | Grupo Finmart [Member]
Derivative [Line Items]
Cross-border debt offering									$ 30,000,000	$ 30,000,000.0
Repayments of long-term debt				$ 17,500,000
2.125% cash convertible senior notes due 2019 [Member]
Derivative [Line Items]
Convertible senior notes issued and settled	$ 30,000,000.0	200,000,000.0
Option to purchase additional principal		$ 30,000,000.0			$ 30,000,000.0		$ 30,000,000.0