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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS (Statement of Operations) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of sales $ 141,865 $ 129,894 $ 380,679 $ 318,456
Gross profit 126,969 114,003 323,618 274,693
Selling, general and administrative 32,532 37,144 92,679 95,747
Operating expenses 62,506 98,331 181,560 203,459
Income from operations 64,463 15,672 142,058 71,234
Income before income taxes 67,659 17,159 149,679 74,949
Income tax expense/(benefit) 7,282 (17,657) 122,494 (9,933)
Net income $ 60,256 $ 34,809 $ 27,041 $ 84,875
Net income per share:        
Basic (in dollars per share) $ 0.87 $ 0.49 $ 0.39 $ 1.20
Diluted (in dollars per share) $ 0.86 $ 0.48 $ 0.38 $ 1.18
As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of sales   $ 132,199   $ 322,842
Gross profit   111,698   270,307
Selling, general and administrative   39,047   101,245
Operating expenses   100,234   208,957
Income from operations   11,464   61,350
Income before income taxes   12,951   65,065
Income tax expense/(benefit)   (17,867)   (10,377)
Net income   $ 30,811   $ 75,435
Net income per share:        
Basic (in dollars per share)   $ 0.43   $ 1.06
Diluted (in dollars per share)   $ 0.43   $ 1.05
Effect of Restatement        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of sales   $ (2,305)   $ (4,386)
Gross profit   2,305   4,386
Selling, general and administrative   (1,903)   (5,498)
Operating expenses   (1,903)   (5,498)
Income from operations   4,208   9,884
Income before income taxes   4,208   9,884
Income tax expense/(benefit)   210   444
Net income   $ 3,998   $ 9,440
Net income per share:        
Basic (in dollars per share)   $ 0.06   $ 0.13
Diluted (in dollars per share)   $ 0.06   $ 0.13