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EARNINGS PER SHARE (Reconciliation of the shares used in the basic and diluted net income per share computation) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
NUMERATOR:        
Net (loss)/income $ 36,313 $ 32,670 $ (33,215) $ 50,066
DENOMINATOR:        
Weighted average shares outstanding - Basic (in shares) 70,361 70,964 70,467 70,909
Stock options (in shares) 1 19 0 23
Time-based restricted stock (in shares) 634 612 0 510
Market-based restricted stock (in shares) 429 675 0 597
Weighted average shares outstanding - Diluted 71,425 72,270 70,467 72,039
EPS:        
Net income per share - Basic (in dollars per share) $ 0.52 $ 0.46 $ (0.47) $ 0.71
Effect of dilutive shares (in dollars per share) 0.01 0.01 (0.00) 0.02
Net income per share - Diluted (in dollars per share) $ 0.51 $ 0.45 $ (0.47) $ 0.69