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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)

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