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Employee Benefit Plans (Defined Contribution Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Defined Contribution Pension Plans        
Defined Contribution Plan Disclosure        
Defined contribution plan expense $ 5,686 $ 5,058 $ 11,367 $ 10,088
U.S. Plans        
Defined Contribution Plan Disclosure        
Defined contribution plan expense 4,136 3,586 8,108 7,256
Non-U.S. Plans        
Defined Contribution Plan Disclosure        
Defined contribution plan expense $ 1,550 $ 1,472 $ 3,259 $ 2,832