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Derivative Financial Instruments (Tables)
9 Months Ended
Jun. 30, 2021
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, 2021 and September 30, 2020:
 June 30, 2021
 Contract AmountFair Value
 Foreign
Currency
USDUSD
 (In thousands)
Sell foreign currency:
Euro (EUR)EUR 16,600 $19,715 $— 
Buy foreign currency:
British pound (GBP)GBP 14,601 $20,300 $— 
Singapore dollar (SGD)SGD5,363 $4,000 $— 
 September 30, 2020
 Contract AmountFair Value
 Foreign
Currency
USDUSD
 (In thousands)
Sell foreign currency:
Euro (EUR)EUR 15,000 $17,656 $— 
Buy foreign currency:
British pound (GBP)GBP 16,555 $21,300 $— 
Singapore dollar (SGD)SGD7,815 $5,700 $— 
Losses on Derivative Financial Instruments
Gains (losses) on derivative financial instruments were 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,
 2021202020212020
 (In thousands)
Gains (losses) on foreign currency forward contracts$88 $(380)$3,003 $(1,429)