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INCOME TAXES, Income Before Income Taxes and Taxes on Income (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Before Income Taxes [Abstract]                      
Domestic                 $ 46,254 $ 33,272 $ 7,130
Foreign                 115,457 76,100 63,308
Income before income taxes $ 45,023 $ 43,044 $ 36,992 $ 36,652 $ 32,713 $ 25,679 $ 23,073 $ 27,907 161,711 109,372 70,438
U.S. federal and state [Abstract]                      
Current                 14,698 8,606 609
Deferred                 10,347 1,550 (1,465)
Total                 25,045 10,156 (856)
Foreign [Abstract]                      
Current                 26,135 13,422 11,737
Deferred                 488 (1,158) (292)
Total                 26,623 12,264 11,445
Total U.S. and foreign $ (3,195) $ 7,873 $ 7,255 $ 39,735 $ 6,211 $ 5,740 $ 4,793 $ 5,676 $ 51,668 $ 22,420 $ 10,589