Fair Value Measurements (Schedule of Qualitative Information) (Details) - item	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated change of control dates	2024-12	2023-09
Minimum [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant unobservable input	0.141	0.136
Minimum [Member] | Probability Of Change Of Control [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant unobservable input	0.20	0.20
Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated change of control dates	2026-12	2025-09
Maximum [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant unobservable input	0.151	0.142
Maximum [Member] | Probability Of Change Of Control [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant unobservable input	0.90	0.90