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INCOME TAXES (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Sep. 27, 2014
Income Tax Disclosure [Abstract]        
Change in permanent reinvestment assertion $ 0 $ (9,696) $ (19,704)  
Tax impact on restructuring 0 4,238 0  
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 627,000      
Deferred Tax Liabilities, Undistributed Foreign Earnings 21,000      
Undistributed Earnings Not Reinvested In Foreign Operations 500      
Foreign Earnings Repatriated 200      
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 95,800      
Deferred Tax Assets, Tax Credit Carryforwards 4,900      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 11,200      
Excess tax benefits from stock based compensation (4,392) 197 540  
Operating Loss Carryforwards [Line Items]        
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions 882 994 5,231  
Unrecognized Tax Benefits 12,062 7,453 7,101 $ 7,192
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 165,800      
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 24,300      
Operations In Singapore And Malaysia [Member]        
Operating Loss Carryforwards [Line Items]        
Income Tax Reconciliation, Tax Exempt Income $ 23,300 $ 8,700 $ 6,000  
Income Tax Reconciliation Foreign Income Tax Rate Differential Per Share $ 0.32 $ 0.12 $ 0.08  
Minimum [Member]        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforward, Foreign, Statute Of Limitions 4 years      
Minimum [Member] | Operations In Singapore And Malaysia [Member]        
Operating Loss Carryforwards [Line Items]        
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential     0.00%  
Maximum [Member]        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforward, Foreign, Statute Of Limitions 6 years      
Maximum [Member] | Operations In Singapore And Malaysia [Member]        
Operating Loss Carryforwards [Line Items]        
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential 5.00%      
Pennsylvania Tax Law [Member]        
Operating Loss Carryforwards [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, State and Local $ 5,000 $ 0 $ 4,000 $ 4,000