Derivative Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

The following tables summarize our outstanding foreign currency forward contracts, by currency at September 30, 2015 and 2014:

		September 30, 2015
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
		(In thousands)
Sell foreign currency:
Canadian dollar (CAD)	CAD	2,750	$	2,045	$	—
Euro (EUR)	EUR	5,600	$	6,296	—
Buy foreign currency:
British pound (GBP)	GBP	6,943	$	10,550	—

		September 30, 2014
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
		(In thousands)
Sell foreign currency:
Canadian dollar (CAD)	CAD	3,300	$	2,960	$	—
Euro (EUR)	EUR	3,800	$	4,790	—
Buy foreign currency:
British pound (GBP)	GBP	6,795	$	11,000	—

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

These amounts are shown below for the years ended September 30, 2015, 2014 and 2013:

	Year Ended September 30,
	2015			2014		2013
	(In thousands)
Gain (loss) on foreign currency forward contracts	$	(62	)	$	256	$	25