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Derivatives and Hedging (Notional Values of Derivative Instruments) (Details) - Not Designated as Hedging Instrument $ in Thousands, € in Millions, ₩ in Millions, ¥ in Millions, £ in Millions | Sep. 30, 2025 USD ($) metricTon | Sep. 30, 2025 CNY (¥) metricTon | Sep. 30, 2025 EUR (€) metricTon | Sep. 30, 2025 KRW (₩) metricTon | Sep. 30, 2025 GBP (£) metricTon
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October 2025 - December 2025 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | $ | $ 2,000 |  |  |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69 | 69 | 69
January 2026 - March 2026 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | $ | $ 2,000 |  |  |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69 | 69 | 69
April 2026 - June 2026 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | $ | $ 2,000 |  |  |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69 | 69 | 69
July 2026 - September 2026 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | $ | $ 2,100 |  |  |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69 | 69 | 69
USD/CNH | Foreign Currency Derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | $ 49,100 | ¥ 350.0 |  |  |
EUR/USD | Foreign Currency Derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | 13,000 |  | € 11.1 |  |
KRW/USD | Foreign Currency Derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | 2,100 |  |  | ₩ 2,959.1 |
USD/GBP | Foreign Currency Derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values of foreign currency derivatives | $ 8,600 |  |  |  | £ 6.4

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