Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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
Derivative Instrument	Balance Sheet Location	March 31, 2016			March 31, 2015			September 30, 2015
		(in thousands)
Foreign currency forwards	Prepaid expenses and other current assets	$	7,694		$	2,530		$	14,169
Cash Convertible Notes Hedges	Other assets, net	3,219			27,215			10,505
Cash Convertible Notes Embedded Derivative	Long-term debt, less current maturities	(3,219		)	(27,215		)	(10,505		)

		Amount of Unrealized Gain (Loss) on Derivatives
		Three Months Ended March 31,					Six Months Ended March 31,
Derivative Instrument	Income Statement Location	2016			2015		2016			2015
		(in thousands)
Foreign currency forwards	Other expense*	$	(1,805	)	$	784	$	(2,918	)	$	7,798

*Amount is partially offset by gains and losses caused by related foreign currency fluctuations.