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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Oct. 01, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Option and purchase right $ 1,490 $ 0  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Option and purchase right 7,739 7,739  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other Current Liabilities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Option and purchase right (1,490) 0  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other Noncurrent Liabilities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Option and purchase right $ (6,249) $ (7,739)  
Frontier      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Remaining percentage to be acquired     40.00%
Percentage of voting interests acquired 8.00%   60.00%