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Derivatives and Fair Value Measurements - Narrative (Details) - USD ($)
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
May 05, 2017
Estimated unrealized losses, net of tax, expected to be reclassified in next 12 months $ 1,700,000      
Amount of debt outstanding 150,000,000 $ 283,000,000    
Gains (losses) recognized in income for derivatives related to ineffective portions and amounts excluded from effectiveness testing 0 0 $ 0  
Revolving Credit Facility | Line of Credit        
Amount of debt outstanding 0 108,000,000   $ 75,000,000
Derivatives designated as hedging instruments | Derivatives in Cash Flow Hedging Relationships | Forward currency forward contracts        
Notional amount of forward exchange contracts 74,000,000 67,000,000    
Fair value of derivative asset   2,000,000    
Fair value of derivative liability 1,700,000      
Derivatives designated as hedging instruments | Derivatives in Cash Flow Hedging Relationships | Interest rate swaps        
Notional amount of forward exchange contracts       $ 75,000,000
Fixed interest rate       0.875%
Derivatives not designated as hedging instruments | Forward currency forward contracts        
Notional amount of forward exchange contracts 28,600,000 10,600,000    
Fair value of derivative liability $ 100,000 $ 100,000