XML 62 R54.htm IDEA: XBRL DOCUMENT v3.26.1
Fair Value Measurement - Narrative (Details) - USD ($)
Mar. 31, 2026
Sep. 30, 2025
Fair value measurement    
Money market funds, at carrying value $ 101,600,000 $ 79,300,000
Guaranteed investment certificates 8,700,000 11,200,000
Nonrecurring    
Fair value measurement    
Fair value, asset (liability) $ 0 $ 0