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Detail of Certain Balance Sheet Accounts (Tables)
12 Months Ended
Sep. 30, 2021
Detail of Certain Balance Sheet Accounts [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Year Ended September 30,
20212020
Accounts payable, trade$136,967 $93,315 
Accrued compensation and benefits61,109 53,933
Accrued insurance liabilities5,787 6,254
Current operating lease liabilities13,973 11,056
Other accrued expenses31,278 22,152
$249,114 $186,710 
Schedule of Other Assets [Table Text Block]
Year Ended September 30,
20212020
Executive Savings Plan assets$937 $766 
Securities and equity investments10 — 
Right of use asset - finance leases3,927 1,600 
Other2,175 3,414 
Total$7,049 $5,780