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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Valuation And Qualifying Accounts Disclosure [Line Items]      
Currency translation adjustments $ 123 $ 112 $ 96
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 7,908 3,938 3,776
Additions: Charged to Costs and Expenses 4,293 4,899 207
Additions: Charged to Other Accounts [1] 30 251 466
Deductions [2] (5,342) (1,180) (511)
Balance at End of Year 6,889 7,908 3,938
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 3,638 4,522 3,714
Additions: Charged to Costs and Expenses 12 19 73
Additions: Charged to Other Accounts [1]     553
Deductions [2] (1,818) (903) 182
Balance at End of Year $ 1,832 $ 3,638 $ 4,522
[1] Includes recoveries of accounts previously written off.
[2] Represents accounts receivable written off against the allowance for uncollectible accounts and releases of valuation reserves to income tax expense.  Also included are foreign currency exchange rate adjustments.  Currency translation adjustments resulted in a decrease in the reserves of $123 in fiscal year 2020, an increase in the reserves of $112 in fiscal year 2019, and an increase in the reserves of $96 in fiscal year 2018.