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RESTRUCTURING - Summary of Restructuring Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Sep. 27, 2014
Restructuring Cost and Reserve [Line Items]        
Provision for severance and benefits [1] $ 3,311 $ 8,644    
Payment of severance and benefits (5,245) (3,620)    
Accrual for estimated severance and benefits, end of period [2] 4,628 6,562 $ 1,538  
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision for severance and benefits [1] 3,273 661 1,850  
Payment of severance and benefits (418) (2,162) (312)  
Accrual for estimated severance and benefits, end of period [2] 2,892 37 1,538 $ 0
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision for severance and benefits [1] 38 7,983    
Payment of severance and benefits (4,827) (1,458)    
Accrual for estimated severance and benefits, end of period [2] $ 1,736 $ 6,525 $ 0  
[1] Provision for severance and benefits and other exit costs are included within selling, general and administrative expenses on the Consolidated Statements of Operations.
[2] Included within accrued expenses and other current liabilities on the Consolidated Balance Sheets.