Derivative Financial Instruments (Tables)

3 Months Ended

Dec. 31, 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 December 31, 2019 and September 30, 2019:

	December 31, 2019
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
	(In thousands)
Sell foreign currency:
Euro (EUR)	EUR	10,000	$	11,172	$	—
Buy foreign currency:
British pound (GBP)	GBP	6,277	$	8,300	$	—
Singapore dollar (SGD)	SGD	5,631	$	4,200	$	—

	September 30, 2019
	Contract Amount				Fair Value
	Foreign Currency		US$		US$
	(In thousands)
Sell foreign currency:
Euro (EUR)	EUR	10,800	$	11,723	$	—
Buy foreign currency:
British pound (GBP)	GBP	5,200	$	6,400	$	—
Singapore dollar (SGD)	SGD	5,798	$	4,200	$	—

Losses on Derivative Financial Instruments

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

	Quarter Ended December 31,
	2019		2018
	(In thousands)
Gains (losses) on foreign currency forward contracts	$	1,145	$	(404	)