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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2021
Apr. 08, 2021
Sep. 30, 2020
Oct. 01, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Unrealized Gain on Securities $ 532      
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Earn-outs related to acquisitions, beginning balance 295      
Earn-outs related to acquisitions, ending balance 1,056      
Option and purchase right 6,249   $ 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]        
Earn-outs related to acquisitions, beginning balance 1,056      
Earn-outs related to acquisitions, ending balance 1,056      
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%
Option and purchase right   $ 1,490    
Percentage of voting interests acquired 68.00% 8.00%   60.00%