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Fair Value Measurement - Narrative (Details) - USD ($)
Dec. 31, 2024
Sep. 30, 2024
Fair value measurement    
Money market funds, at carrying value $ 62,300,000 $ 67,200,000
Guaranteed investment certificates 10,400,000 2,300,000
Nonrecurring    
Fair value measurement    
Fair value, asset (liability) $ 0 $ 0