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Accrued Expenses and Other Liabilities
 6 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities
Accrued expenses and other liabilities consisted of the following:
March 31,
2021		September 30,
2020
Salaries, wages and other benefits$59,245 $67,766 
Obligation under operating leases13,119 12,767 
Obligation under finance leases11,869 11,362 
Third party commissions9,192 9,270 
Taxes, other than income3,939 5,316 
Insurance liabilities3,760 3,954 
Provisions for litigation2,072 2,580 
Frontier Option liability1,490 — 
Severance payments1,185 970 
Earn-outs related to acquisitions295 295 
Fair value of liability derivatives166 4,716 
Other28,360 24,393 
$134,692 $143,389