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Investments (Tables)
 9 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Non-Current Investments Non-current investments consisted of the following:
 June 30, 2021September 30, 2020
Equity and fixed income mutual funds$25,949 $24,610 
Life insurance policies4,653 4,621 
Other (primarily cost-method) investments19,044 34,019 
 $49,646 $63,250