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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 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:
 March 31, 2021September 30, 2020
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets:        
Derivatives (1)
$— $471 $— $471 $— $— $— $— 
Equity and fixed income mutual funds— 25,455 — 25,455 — 24,610 — 24,610 
Life insurance policies— 4,626 — 4,626 — 4,621 — 4,621 
Total assets at fair value$— $30,552 $— $30,552 $— $29,231 $— $29,231 
Liabilities:        
Derivatives (1)
$— $3,376 $— $3,376 $— $7,792 $— $7,792 
Total liabilities at fair value$— $3,376 $— $3,376 $— $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.