Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Schedule of Qualitative Information) (Details)

v3.21.2
Fair Value Measurements (Schedule of Qualitative Information) (Details) - item
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated change of control dates Sep. 01, 2022 Dec. 01, 2021
Minimum [Member] | Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 6.6 14.1
Minimum [Member] | Probability Of Change Of Control [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 20 20
Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated change of control dates Sep. 01, 2025 Jun. 01, 2022
Maximum [Member] | Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 7.9 16.0
Maximum [Member] | Probability Of Change Of Control [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 90 90