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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Assets and Liabilities Measured on a Recurring Basis
The fair values of the Company's assets and liabilities measured on a recurring basis are categorized as follows:
 June 30, 2021September 30, 2020
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets:        
Equity and fixed income mutual funds$— $25,949 $— $25,949 $— $24,610 $— $24,610 
Life insurance policies— 4,653 — 4,653 — 4,621 — 4,621 
Total assets at fair value$— $30,602 $— $30,602 $— $29,231 $— $29,231 
Liabilities:        
Derivatives (1)
$— $2,982 $— $2,982 $— $7,792 $— $7,792 
Total liabilities at fair value$— $2,982 $— $2,982 $— $7,792 $— $7,792 
(1) Interest rate swaps are valued based on observable market swap rates and are classified within Level 2 of the fair value hierarchy.