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Pension Plan and Retirement Benefits - Benefit Obligation Assumptions (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2007
Sep. 30, 2019
Sep. 30, 2018
Pension Plans Defined Benefit Us [Member]      
Assumptions used to determine benefit obligation      
Discount rate (as a percent)   2.88% 4.00%
Rate of compensation increase (as a percent)   2.50% 2.50%
Pension Plans Defined Benefit Non Us [Member]      
Assumptions used to determine benefit obligation      
Discount rate (as a percent)   1.70% 2.80%
Postretirement Health Care Benefits      
Assumptions relating to health care cost trend rates      
Annual rate of increase for the costs of covered health care benefits on the basis of age (as a percent)   5.00%  
Effect of one percentage point change in assumed health care cost trend rates      
Maximum liability related to total retiree health care costs under plan amendment $ 5,000    
Assumptions used to determine benefit obligation      
Discount rate (as a percent)   3.13% 4.13%
Postretirement Health Care Benefits | Minimum      
Assumptions relating to health care cost trend rates      
Employee age required to participate in the plan   65 years  
Postretirement Health Care Benefits | Maximum      
Assumptions relating to health care cost trend rates      
Employee age required to participate in the plan   65 years  
Postretirement Health Care Benefits | Under 65 age group      
Assumptions relating to health care cost trend rates      
Annual rate of increase for the costs of covered health care benefits on the basis of age (as a percent)   5.00% 5.00%
Postretirement Health Care Benefits | Over 65 age group      
Assumptions relating to health care cost trend rates      
Annual rate of increase for the costs of covered health care benefits on the basis of age (as a percent)   5.00% 5.00%