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Detail of Certain Balance Sheet Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Detail of Certain Balance Sheet Accounts [Abstract]    
Accounts Receivable, Allowance for Credit Loss, Beginning $ 2,613  
Accounts Receivable, Allowance for Credit Loss, Ending 2,387 $ 2,613
Accounts payable, trade 136,967 93,315
Accrued compensation and benefits 61,109 53,933
Accrued insurance liabilities 5,787 6,254
Current operating lease liabilities 13,973 11,056
Other accrued expenses 31,278 22,152
Accounts payable and accrued expenses 249,114 186,710
Executive Savings Plan assets 937 766
Securities and equity investments 10 0
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 3,927 1,600
Other 2,175 3,414
Other non-current assets $ 7,049 $ 5,780