Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) derivative_instrument Contract	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) derivative_instrument Contract	Jun. 30, 2024 USD ($)	Sep. 30, 2024 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	$ (7,500,000)		$ (7,500,000)
Unrecognized pre-tax loss			29,800,000		$ (39,800,000)
Impairment of intangible assets	0	$ 110,600,000	0	$ 110,600,000
Interest Rate Contracts
Derivative [Line Items]
Fixed interest rate							1.042%
Notional value decrease each year						$ 100,000,000.0
Notional value	600,000,000.0		600,000,000.0					$ 600,000,000.0
Line of Credit \| Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	880,000,000.0		880,000,000.0
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,354,300,000		2,354,300,000		2,305,500,000
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,441,200,000		2,441,200,000		2,398,800,000
Designated as Hedging Instrument \| Cash Flow Hedging
Derivative [Line Items]
Derivatives - Foreign Currency contracts	21,300,000		21,300,000		39,200,000
Designated as Hedging Instrument \| Cash Flow Hedging \| Zinc contracts
Derivative [Line Items]
Notional value	31,000,000		31,000,000
Derivatives - Foreign Currency contracts	$ (800,000)		$ (800,000)		4,000,000.0
Derivative, number of open contracts \| Contract	16		16
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign currency contracts
Derivative [Line Items]
Notional value	$ 152,000,000		$ 152,000,000
Derivatives - Foreign Currency contracts	$ (7,700,000)		$ (7,700,000)		(4,600,000)
Number of open contracts \| derivative_instrument	58		58
Not Designated as Hedging Instrument \| Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ 2,400,000		$ 2,400,000		$ 2,900,000
Not Designated as Hedging Instrument \| Foreign currency contracts
Derivative [Line Items]
Notional value	$ 141,000,000		$ 141,000,000
Number of open contracts \| derivative_instrument	8		8

ENERGIZER HOLDINGS, INC. 10-Q