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Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred Tax Assets |  |  |
Retirement Benefit Obligations | $ 32,249 |  | $ 38,915
Net Operating Loss Carryforwards | 10,773 | $ 3,700 | 12,686
Tax Credit Carryforwards | 2,704 |  | 3,536
Other, net | 1,571 |  | 1,155
Total Deferred Tax Assets | 47,297 |  | 56,292
Deferred Tax Liabilities |  |  |
Utility Plant Differences | 132,682 |  | 127,932
Regulatory Assets & Liabilities | 6,429 |  | 9,323
Other, net | 5,964 |  | 1,894
Total Deferred Tax Liabilities | 145,075 |  | 139,149
Net Deferred Tax Liabilities | $ 97,778 |  | $ 82,857

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