Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 15, 2022	Nov. 11, 2019	Jan. 28, 2019	Nov. 12, 2018	Jan. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Jul. 01, 2015
Class of Stock [Line Items]
Common stock authorized (in shares)							300,000,000
Preferred stock, authorized (in shares)							10,000,000
Common stock, par value (in dollars per share)							$ 0.01	$ 0.01
Common stock issued (in shares)					4,687,498		72,386,840	62,420,421
Shares reserved for issuance (in shares)							200,000	200,000
Preferred stock issued (in shares)					2,156,250		2,156,250	0
Repurchased shares of common stock (in shares)							1,036,000	1,439,211	1,389,027
Common stock purchased							$ 45,000	$ 70,000	$ 58,700
Payments for repurchase of common stock							$ 43.46	$ 48.66	$ 42.23
Share repurchase liability								$ 800
Dividends declared							$ 82,400	72,100	$ 69,300
Dividends paid							83,000	70,000	69,100
Dividends declared (in dollars per share)				$ 0.30
Net proceeds from issuance of common stock						$ 205,300	$ 205,300	0	0
Mandatory convertible preferred stock (in dollars per share)					$ 0.01		$ 0.01
Liquidation preference (in dollars per share)					$ 100.00
Net proceeds from MCPS						$ 199,500
Annual rate percentage					7.50%
Dividends to preferred shareholders							$ 12,000
Dividends paid on MCPS							8,000	$ 0	$ 0
Payments for capped call transactions			$ 9,000
Preferred Stock
Class of Stock [Line Items]
Accrued dividends							$ 4,000
Common Stock
Class of Stock [Line Items]
Number of shares authorized for repurchase							2,800,000			7,500,000
Repurchased shares of common stock (in shares)							1,036,000	1,439,000	1,389,000
Treasury Stock
Class of Stock [Line Items]
Common stock purchased							$ 45,000	$ 70,000	$ 58,700
Retained Earnings
Class of Stock [Line Items]
Dividends declared							82,400	$ 72,100	$ 69,300
Dividends to preferred shareholders							$ 12,000
Energizer Holdings, Inc. Equity Incentive Plan
Class of Stock [Line Items]
Reserved for issuance							1,900,000
Over-Allotment Option
Class of Stock [Line Items]
Common stock issued (in shares)					611,412
Preferred stock issued (in shares)					281,250
Spectrum Auto Care Acquisition
Class of Stock [Line Items]
Shares issued in acquisition (in shares)			5,278,921
Fair value of equity in acquisition			$ 240,500
Closing stock price (in dollars per share)			$ 45.55
Percentage of outstanding common shares			4.90%
Value of common stock in company acquired			$ 65,120
Minimum | Scenario, Forecast
Class of Stock [Line Items]
Shares of common stock (in shares)	1,789,200
Maximum | Scenario, Forecast
Class of Stock [Line Items]
Shares of common stock (in shares)	2,173,900
Subsequent Event
Class of Stock [Line Items]
Cash dividend (in dollars per share)		$ 1.875