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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
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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