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Employee Benefit Plans (Defined Contribution Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Defined Contribution Pension Plans    
Defined Contribution Plan Disclosure    
Defined contribution plan expense $ 5,681 $ 5,030
U.S. Plans    
Defined Contribution Plan Disclosure    
Defined contribution plan expense 3,972 3,670
Non-U.S. Plans    
Defined Contribution Plan Disclosure    
Defined contribution plan expense $ 1,709 $ 1,360