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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS (Statement of Operations) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of sales $ 122,325 $ 107,350 $ 238,814 $ 188,562
Gross profit 99,447 92,263 196,649 160,690
Selling, general and administrative 32,354 30,740 60,147 58,603
Operating expenses 61,011 55,760 119,054 105,128
Income from operations 38,436 36,503 77,595 55,562
Income before income taxes 41,152 37,821 82,020 57,790
Income tax expense 4,800 5,151 115,212 7,724
Net income $ 36,313 $ 32,670 $ (33,215) $ 50,066
Net income per share:        
Basic (in dollars per share) $ 0.52 $ 0.46 $ (0.47) $ 0.71
Diluted (in dollars per share) $ 0.51 $ 0.45 $ (0.47) $ 0.69
As Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of sales   $ 109,322   $ 190,643
Gross profit   90,291   158,609
Selling, general and administrative   32,666   62,198
Operating expenses   57,686   108,723
Income from operations   32,605   49,886
Income before income taxes   33,923   52,114
Income tax expense   4,882   7,490
Net income   $ 29,041   $ 44,624
Net income per share:        
Basic (in dollars per share)   $ 0.41   $ 0.63
Diluted (in dollars per share)   $ 0.40   $ 0.62
Effect of Restatement        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of sales   $ (1,972)   $ (2,081)
Gross profit   1,972   2,081
Selling, general and administrative   (1,926)   (3,595)
Operating expenses   (1,926)   (3,595)
Income from operations   3,898   5,676
Income before income taxes   3,898   5,676
Income tax expense   269   234
Net income   $ 3,629   $ 5,442
Net income per share:        
Basic (in dollars per share)   $ 0.05   $ 0.08
Diluted (in dollars per share)   $ 0.05   $ 0.07