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Pension Plan and Retirement Benefits - Defined Benefit Plans - Expense (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2007
USD ($)
Sep. 30, 2017
USD ($)
person
Sep. 30, 2017
USD ($)
person
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Pension Plan and Retirement Benefits          
Accrued pension and postretirement benefits   $ 204,910 $ 204,910 $ 255,346  
Defined Benefit Pension Plans          
Pension Plan and Retirement Benefits          
Pension plan expense     14,515 11,396 $ 5,437
Accrued pension and postretirement benefits   $ 86,709 86,709 129,375  
Contribution to plan     6,804 6,778  
U.S. pension plan          
Pension Plan and Retirement Benefits          
Contribution to plan     $ 6,000 6,000 1,500
Number of participants that received distribution | person   146 146    
Amount of distributions   $ 8,688,000      
U.K. pension plan          
Pension Plan and Retirement Benefits          
Contribution to plan     $ 804 778 909
Non-qualified pension plan          
Pension Plan and Retirement Benefits          
Pension plan expense     19 91 140
Accrued pension and postretirement benefits   777 777 854  
Postretirement Health Care Benefits          
Pension Plan and Retirement Benefits          
Pension plan expense     8,920 7,652 $ 7,155
Accrued pension and postretirement benefits   $ 117,424 117,424 125,117  
Maximum liability related to total retiree health care costs under plan amendment $ 5,000        
Contribution to plan     $ 4,263 $ 5,527