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Schedule II (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Currency translation adjustments $ (96) $ 64 $ 77
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 3,776 2,540 3,841
Additions: Charged to Costs and Expenses 207 1,063 255
Additions: Charged to Other Accounts 466 449 233
Deductions (511) (276) (1,789)
Balance at End of Year 3,938 3,776 2,540
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 3,714 3,317 6,804
Additions: Charged to Costs and Expenses 73 77 53
Additions: Charged to Other Accounts 553    
Deductions 182 320 (3,540)
Balance at End of Year $ 4,522 $ 3,714 $ 3,317