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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Sep. 30, 2016
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ 1,000 $ 1,000 $ 2,500 $ 900  
Forward Contracts | Other Current Liabilities [Member]          
Foreign currency cash flow hedge asset at fair value 2,758   2,758    
Forward Contracts | Other Current Assets [Member]          
Foreign currency cash flow hedge asset at fair value 1,597   1,597    
Forward Contracts | Other Assets [Member]          
Foreign currency cash flow hedge asset at fair value 10   10    
Forward Contracts | Other Noncurrent Liabilities [Member]          
Foreign currency cash flow hedge asset at fair value $ 4   4    
Forward Contracts | Not Designated as Hedging Instrument [Member]          
Derivative, Remaining Maturity 3 months        
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value $ 1,081   1,081    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 2,717   2,717    
Forward Contracts | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]          
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value         $ 1,693
Forward Contracts | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]          
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value         216
Forward Contracts | Designated as Hedging Instrument [Member]          
Derivative, Remaining Maturity 13 months        
Foreign currency cash flow hedge asset at fair value $ 526   526    
Foreign Currency Cash Flow Hedge Liability at Fair Value $ 45   $ 45    
Forward Contracts | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]          
Foreign Currency Cash Flow Hedge Liability at Fair Value         1,477
Forward Contracts | Designated as Hedging Instrument [Member] | Other Current Assets [Member]          
Foreign currency cash flow hedge asset at fair value         $ 44