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Product Warranties (Summary Of Activity In Warranty Accrual) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]        
Warranty accrual at beginning of period $ 27,748 $ 22,883 $ 25,848 $ 21,363
Warranties issued during current period 3,280 4,741 8,037 8,155
Adjustments to pre-existing warranties (175) (106) (245) (371)
Reductions for settling warranties (3,007) (4,419) (5,922) (5,463)
Foreign currency translation 409 173 537 (412)
Warranty accrual at end of period $ 28,255 $ 23,272 $ 28,255 $ 23,272