Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Sep. 30, 2015

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, 2015		September 30, 2014
		(in thousands)
Foreign currency forwards	Prepaid expenses and other current assets	$	3,488	$	2,420

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

	Amount of (Loss) Gain Recognized in Other Comprehensive Income on Derivatives
	Fiscal Year Ended September 30,
Derivative Instrument	2015		2014			2013
	(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
		Fiscal Year Ended September 30,
Derivative Instrument	Location of Gain	2015			2014		2013
		(in thousands)
Foreign currency forwards	Other expense	$	(457	)	$	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 of Derivative Instruments
Derivative Instrument	Balance Sheet Location	September 30, 2015			September 30, 2014
		(in thousands)
Foreign currency forwards	Prepaid expenses and other current assets	$	10,681		$	1,152
Convertible Notes Hedges	Other assets, net	10,505			36,994
Cash Convertible Notes Embedded Derivative	Long-term debt, less current maturities	(10,505		)	(36,994		)

		Amount of Unrealized Gain on Derivatives
		Fiscal Year Ended September 30,
Derivative Instrument	Income Statement Location	2015		2014		2013
		(in thousands)
Foreign currency forwards	Other expense	$	9,529	$	1,152	$	—