Derivative Financial Instruments (Tables)

9 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Outstanding Foreign Currency Forward Contracts

The following tables summarize our outstanding foreign currency forward contracts, by currency, at June 30, 2019 and September 30, 2018:

	June 30, 2019
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
	(In thousands)
Sell foreign currency:
Euro (EUR)	EUR	9,800	$	11,149	$	—
Buy foreign currency:
British pound (GBP)	GBP	8,743	$	11,100	$	—
Singapore dollar (SGD)	SGD	6,630	$	4,900	$	—

	September 30, 2018
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
	(In thousands)
Sell foreign currency:
Euro (EUR)	EUR	9,000	$	10,372	$	—
Buy foreign currency:
British pound (GBP)	GBP	8,598	$	11,200	$	—
Singapore dollar (SGD)	SGD	9,580	$	7,000	$	—

Losses on Derivative Financial Instruments

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

	Quarter Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Losses on foreign currency forward contracts	$	928	$	870	$	612	$	251