Summary of Significant Accounting Policies - Summary of Percentages on Timing of Revenue Recognition (Details) - Product Concentration Risk - Revenue from Contract with Customer Benchmark	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Goods and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	93.80%	93.80%	93.80%
Goods and services transferred over time
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	6.20%	6.20%	6.20%