Annual report pursuant to Section 13 and 15(d)

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

v3.20.2
Fair Value Measurements (Schedule of Qualitative Information) (Details) - item
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated change of control date Dec. 01, 2021 Sep. 01, 2020
Minimum [Member] | Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 14.10 14.4
Minimum [Member] | Probability Of Change Of Control [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 20 10
Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated change of control date Jun. 01, 2022 Dec. 01, 2021
Maximum [Member] | Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 16.00 16.8
Maximum [Member] | Probability Of Change Of Control [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 90 90