Derivative Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2016

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 March 31, 2016 and September 30, 2015:

	March 31, 2016
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
	(In thousands)
Sell foreign currency:
Canadian dollar (CAD)	CAD	1,250	$	963	$	—
Euro (EUR)	EUR	5,500	$	6,303	$	—
Buy foreign currency:
British pound (GBP)	GBP	5,026	$	7,250	$	—

	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	$	—

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

Losses on derivative financial instruments are recorded in our condensed consolidated statements of income and comprehensive income as a component of other income (expense), net, and consisted of the following: 

	Quarter Ended March 31,				Six Months Ended March 31,
	2016		2015		2016		2015
	(In thousands)
Losses on foreign currency forward contracts	$	956	$	10	$	1,255	$	339