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No definition available.

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- Definition

Derivative, Number of Open Contracts

+ References

No definition available.

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- Definition

Long-term Debt, Percentage Bearing Fixed Interest, Fair Value Disclosure

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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- Definition

The number of derivative instruments of a particular group held by the entity.

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

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Financial Instruments and Risk Management - Narrative (Details)	9 Months Ended	12 Months Ended
	Jun. 30, 2026 USD ($) derivative_instrument Contract	Sep. 30, 2025 USD ($)	Dec. 22, 2024 USD ($)	Feb. 22, 2023	Jan. 22, 2021 USD ($)
Derivative [Line Items]
Portion or pre-tax gain included in AOCI expected to be included in earnings	$ 700,000
Unrecognized pre-tax loss	19,400,000	$ (25,300,000)
Interest Rate Contracts
Derivative [Line Items]
Fixed interest rate				1.042%
Notional value decrease each year			$ 100,000,000.0
Notional value	500,000,000.0				$ 500,000,000.0
Line of Credit \| Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	791,900,000
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,456,600,000	2,473,500,000
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,517,200,000	2,537,700,000
Designated as Hedging Instrument \| Cash Flow Hedging
Derivative [Line Items]
Derivatives - Foreign Currency contracts	23,600,000	22,900,000
Designated as Hedging Instrument \| Cash Flow Hedging \| Zinc contracts
Derivative [Line Items]
Notional value	24,000,000
Derivatives - Foreign Currency contracts	$ 3,400,000	1,500,000
Derivative, number of open contracts \| Contract	15
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign currency contracts
Derivative [Line Items]
Notional value	$ 87,000,000
Derivatives - Foreign Currency contracts	$ 800,000	(3,900,000)
Number of open contracts \| derivative_instrument	34
Not Designated as Hedging Instrument \| Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ (1,600,000)	$ (500,000)
Not Designated as Hedging Instrument \| Foreign currency contracts
Derivative [Line Items]
Notional value	$ 139,000,000
Number of open contracts \| derivative_instrument	8