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Revenue - Revenue Recognition Narrative (Details) - Revenue from Contract with Customer Benchmark - Product Concentration Risk
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Transferred over Time    
Revenue from External Customer [Line Items]    
Revenue from sales orders, percentage 96.00% 95.00%
Transferred at Point in Time    
Revenue from External Customer [Line Items]    
Revenue from sales orders, percentage 4.00% 5.00%