Share-Based Payments (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended					12 Months Ended
	Nov. 18, 2025 $ / shares shares	Nov. 30, 2024 $ / shares shares	Nov. 30, 2023 $ / shares shares	Nov. 30, 2022 $ / shares shares	Nov. 30, 2021 $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022	Jan. 30, 2023 shares	Jan. 27, 2020 shares	Jul. 01, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares										4,300,000
Share-based payments \| $						$ 26.0	$ 23.5	$ 22.2
Income tax benefit \| $						$ 3.7	$ 3.5	3.5
Fair value premium, percentage						0.537	0.476		0.534
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments \| $						$ 26.0	$ 23.5	$ 22.2
Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						1,000,000.0
Fair value of TSR award at grant \| $ / shares						$ 50.02	$ 49.56	$ 44.92
Unrecognized compensation cost \| $						$ 33.1
Weighted-average period of recognition, in years						1 year 1 month 6 days
Weighted-average fair value nonvested \| $						$ 38.5	$ 37.4	$ 40.8
Weighted-average fair value vested \| $						$ 22.7	$ 17.9	10.6
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments \| $								$ 22.2
Energizer Holdings, Inc. Equity Incentive Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares												10,000,000
Energizer Holdings, Inc. Equity Incentive Plan \| Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future awards, shares						6,100,000
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares											6,500,000
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of TSR award at grant \| $ / shares					$ 38.75
2021 Plan \| Key Employees \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted					140,000
Vesting period, in years					4 years
2022 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of TSR award at grant \| $ / shares				$ 29.23
2022 Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period				3 years
2022 Plan \| Key Employees \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				391,000
Vesting period, in years				4 years
2022 Plan \| Key Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares				644,000
2022 Plan \| Key Executives \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				138,000
2022 Plan \| Key Executives and Key Employees [Member] \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted				322,000
2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of TSR award at grant \| $ / shares			$ 33.57
2023 Plan \| Key Employees \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			310,000
Vesting period, in years		4 years	4 years
2023 Plan \| Key Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares			500,000
Performance period			3 years
2023 Plan \| Key Executives \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			107,000
2023 Plan \| Key Executives and Key Employees [Member] \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			250,000
2024 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of TSR award at grant \| $ / shares		$ 32.61
2024 Plan \| Key Employees \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		333,000
2024 Plan \| Key Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares		540,000
Performance period			3 years
2024 Plan \| Key Executives \| Restricted Stock Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		116,000
2024 Plan \| Key Executives \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		270,000
2025 Plan \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of TSR award at grant \| $ / shares	$ 23.82
2025 Plan \| Key Employees \| Restricted Stock Equivalents \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	460,000
Vesting period, in years	4 years
2025 Plan \| Key Employees \| Performance Shares \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be awarded, shares	560,000
Performance period	3 years
2025 Plan \| Key Executives \| Restricted Stock Equivalents \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	280,000
Vesting period, in years	3 years
2025 Plan \| Key Executives and Key Employees [Member] \| Performance Shares \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	280,000

ENERGIZER HOLDINGS, INC. 10-K