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Financial Instruments and Derivatives - Additional Information (Details) gal in Millions, MMBTU in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2020 USD ($)	Apr. 04, 2021 USD ($) MMBTU T gal	Mar. 29, 2020 USD ($)	Apr. 28, 2021 USD ($)	Apr. 07, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)
Derivative [Line Items]
Fair value of commodity cash flow hedges, gain (loss)		$ 1,179,000				$ (647,000)
Commodity gain (loss) expected to be reclassified to the income statement during the next 12 months		953,000
Fair value of foreign currency cash flow hedges, gain (loss)		311,000				555,000
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months		311,000
Proceeds from cross-currency swap		0	$ 14,480,000
Total fair value of other derivatives not designated as hedging instruments		771,000				599,000
1.0% Euro loan due May 2021
Derivative [Line Items]
Outstanding balance		$ 176,100,000
Interest rate (percent)		1.00%
Debt principal		$ 150,000,000
Pending offer | Subsequent Event | 5.75% debentures due November 2040 | Notes
Derivative [Line Items]
Amount offered to be repurchased				$ 300,000,000
Outstanding balance				$ 600,000,000
Interest rate (percent)				5.75%
Early tender premium per thousand dollar principal				$ 50
Percentage of fair value of notes in excess of carrying amount (percent)				25.00%
Natural Gas Swaps
Derivative [Line Items]
Approximate amount of commodity covered by swap contracts outstanding (in MMBTUs) | MMBTU		7.1
Anticipated usage percentage covered by a swap contract for the current fiscal year (percent)		67.00%
Anticipated usage percentage covered by a swap contract for the next fiscal year (percent)		41.00%
Aluminum Swaps
Derivative [Line Items]
Anticipated usage percentage covered by a swap contract for the current fiscal year (percent)		55.00%
Approximate amount of commodity covered by swap contracts outstanding (in tons) | T		2,763
Cross-currency swap
Derivative [Line Items]
Notional amount							$ 250,000,000
Proceeds from cross-currency swap	$ 14,480,000
Tax provision on foreign currency translation gain	$ 7,581,000
Cross-currency swap | Subsequent Event
Derivative [Line Items]
Notional amount					$ 150,000,000
Diesel Swaps
Derivative [Line Items]
Gallons of diesel fuel covered under contract (gallons) | gal		0.5
Forward contracts
Derivative [Line Items]
Fair value of foreign currency cash flow hedges, gain (loss)		$ (289,000)				$ 47,000
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months		(266,000)
Foreign currency gain (loss) reclassified to the income statement		$ 13,000
Reverse Treasury Lock Contract | Subsequent Event
Derivative [Line Items]
Notional amount				$ 100,000,000

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