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SHAREHOLDERS' EQUITY (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Changes in shareholder's equity        
Beginning Balance     $ 759,410  
Net earnings $ 20,067 $ 19,019 56,181 $ 63,684
Other comprehensive income (loss) 1,832 (6,927) (1,919) (2,647)
Ending Balance 811,807 727,254 811,807 727,254
Common Stock [Member]        
Changes in shareholder's equity        
Beginning Balance 305 305 305 305
Stock plans 1   1  
Ending Balance 306 305 306 305
Common Stock Including Additional Paid in Capital [Member]        
Changes in shareholder's equity        
Beginning Balance 293,612 292,404 291,190 289,785
Stock compensation plans (2,408) (2,298) 14 321
Ending Balance 291,204 290,106 291,204 290,106
Retained Earnings [Member]        
Changes in shareholder's equity        
Beginning Balance 643,018 557,249 606,836 516,718
Net earnings 20,067 19,019 56,181 63,684
Cash dividends (2,082) (2,076) (6,227) (6,210)
Adoption of accounting standards updates     4,213  
Ending Balance 661,003 574,192 661,003 574,192
AOCI Attributable to Parent [Member]        
Changes in shareholder's equity        
Beginning Balance (35,280) (23,028) (31,528) (27,308)
Foreign currency translation 1,840 (6,865) (2,013) (2,801)
Pension       61
Forward exchange contracts (7) (62) 94 93
Ending Balance (33,447) (29,955) (33,447) (29,955)
Treasury Stock [Member]        
Changes in shareholder's equity        
Beginning Balance (107,259) (107,394) (107,394) (107,582)
Issued under stock plans     135 188
Ending Balance $ (107,259) $ (107,394) $ (107,259) $ (107,394)