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Employee Benefit Plans (Schedule Of Cost Of The Postretirement Benefit Plan) (Details) - Postretirement Benefit Plan - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 118 $ 161 $ 226
Interest cost 288 468 576
Amortization of actuarial gain (487) (572) (106)
Net periodic postretirement benefit cost $ (81) $ 57 $ 696