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Pension Benefit Obligations - Balance Sheet Recognition (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Amounts recognized in the consolidated balance sheets:      
Pension benefit obligations $ (412,604) $ (559,068)  
United States      
Amounts recognized in the consolidated balance sheets:      
Other non-current assets 2,500 2,300 $ 2,000
Accrued expenses and other current liabilities (9,500) (10,100) (9,300)
Pension benefit obligations (170,600) (204,800) (255,800)
Net amount recognized in the balance sheet (177,600) (212,600) (263,100)
Foreign Pension Plan, Defined Benefit      
Amounts recognized in the consolidated balance sheets:      
Other non-current assets 19,100 13,900 5,300
Pension benefit obligations (242,000) (354,300) (438,300)
Net amount recognized in the balance sheet $ (222,900) $ (340,400) $ (433,000)