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INCOME TAXES (Provision for income taxes and the effective tax rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Income Tax Disclosure [Abstract]        
Income tax expense $ 4,800 $ 5,151 $ 115,212 $ 7,724
Effective tax rate 11.60% 13.60% 140.50% 13.40%