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Retirement Plans (Effect of Change in Assumed Health Care Cost Trend Rate) (Details)
$ in Thousands
12 Months Ended
Sep. 29, 2019
USD ($)
Retirement Benefits [Abstract]  
Total interest and service cost, 1% Point Increase $ 106
Total interest and service cost, 1% Point Decrease (92)
Postretirement benefit obligation, 1% Point Increase 2,737
Postretirement benefit obligation, 1% Point Decrease $ (2,365)