Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Sep. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of derivative financial instruments

		Fair Value of Derivative Instruments
Derivative Instrument	Balance Sheet Location	September 30, 2014		September 30, 2013
		(in thousands)
Foreign currency forwards	Prepaid expenses and other assets	$	2,420	$	1,813

Derivative financial instruments loss (gain) recognized in other comprehensive income

	Amount of (Loss) Gain Recognized in Other Comprehensive Income on Derivatives (Effective Portion)
	Fiscal Year Ended September 30,
Derivative Instrument	2014			2013		2012
	(in thousands)
Foreign currency forwards	$	(453	)	$	2,388	$	—

Derivative financial instruments loss (gain) recognized in income

		Amount of (Loss) Gain on Derivatives Reclassified into Income from Accumulated Other Comprehensive Income (Effective Portion)
		Fiscal Year Ended September 30,
Derivative Instrument	Location of Gain	2014			2013		2012
		(in thousands)
Foreign currency forwards	Interest expense (income), net / Other income	$	(49	)	$	2,536	$	—

Information regarding derivative instruments not designated as hedging instruments

The following tables set forth certain information regarding our derivative instruments not designated as hedging instruments:

		Fair Value Asset (Liability) of Derivative Instruments
		Fiscal Year Ended September 30,
Derivative Instrument	Balance Sheet Location	2014			2013		2012
		(in thousands)
Convertible notes hedges	Other assets, net	$	36,994		$	—	$	—
Convertible notes embedded derivative	Long-term debt, less current maturities	(36,994		)	—		—
	Net balance sheet asset (liability)	$	—		$	—	$	—
Foreign currency forwards	Prepaid expenses and other assets	$	1,152		$	—	$	—
Foreign currency forwards	Other current liabilities	1,308			—		—
	Net balance sheet asset	$	2,460		$	—	$	—

		Amount of Unrealized Gain on Derivatives
		Fiscal Year Ended September 30,
Derivative Instrument	Location of Gain	2014		2013		2012
		(in thousands)
Foreign currency forwards	Other income	$	2,460	$	—	$	—