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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)

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