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Derivative Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 2024
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, 2024 and 2023: 
 September 30, 2024
 Contract AmountFair Value
 Foreign
Currency		USDUSD
 (In thousands)
Sell foreign currency:
Euro (EUR)EUR13,000 $14,531 — 
Buy foreign currency:
British pound (GBP)GBP12,237 $16,400 — 
Singapore dollar (SGD)SGD7,404 $5,800 — 
 
 September 30, 2023
 Contract AmountFair Value
 Foreign
Currency		USDUSD
 (In thousands)
Sell foreign currency:
Euro (EUR)EUR12,900 $13,621 — 
Buy foreign currency:
British pound (GBP)GBP10,700 $13,100 — 
Singapore dollar (SGD)SGD8,569 $6,300 — 
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance
 Year Ended September 30,
 202420232022
 (In thousands)
Gain (loss) on foreign currency forward contracts$1,580 $1,625 $(2,748)