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Income Tax Expense - Tax Effects Of Temporary Differences That Give Rise To Significant Portions Of The Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Deferred tax assets: |  |
Inventories | $ 5,089 | $ 5,834
Pension and other postretirement benefits | 5,533 | 3,969
Net operating and capital loss carryforwards - domestic | 617 | 639
Net operating loss carryforward - foreign | 3,766 | 4,603
Foreign tax credit carryforward | 0 | 2,377
Other compensation-related costs and other cost accruals | 7,952 | 7,048
State credit carryforward | 1,914 | 2,103
Total deferred tax assets | 24,871 | 26,573
Deferred tax liabilities: |  |
Timing differences related to revenue recognition | (1,508) | 0
Goodwill | (2,673) | (969)
Acquisition assets | (60,224) | (62,841)
Depreciation, software amortization | (20,161) | (19,584)
Net deferred tax liabilities before valuation allowance | 59,695 | 56,821
Less valuation allowance | (4,520) | (7,144)
Net deferred tax liabilities | $ (64,215) | $ (63,965)

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