Financial Instruments and Risk Management (Narrative) (Details)		12 Months Ended
		Sep. 30, 2025 USD ($) contracts	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Nov. 13, 2025 USD ($)	Nov. 12, 2025 USD ($)
Derivative [Line Items]
Total long-term debt, including current maturities		$ 1,390,000,000	$ 1,284,000,000
Subsequent Event
Derivative [Line Items]
Share Repurchase Program, Authorized, Amount					$ 100,000,000.0
Purchase offer for Fem Care business						$ 340,000,000.0
Fixed rate debt
Derivative [Line Items]
Fair value of long-term debt		$ 1,198,200,000	$ 1,180,000,000
Customer concentration risk | Wal-Mart | Percentage of Revenue
Derivative [Line Items]
Concentration risk, percentage		17.40%
Sun and Skin Care | Customer concentration risk | Target | Percentage of Revenue
Derivative [Line Items]
Concentration risk, percentage		9.20%
Feminine Care | Customer concentration risk | Target | Percentage of Revenue
Derivative [Line Items]
Concentration risk, percentage		10.10%
Razors and blades | Wet Shave | Product concentration risk | Percentage of Revenue
Derivative [Line Items]
Concentration risk, percentage		49.70%	49.30%	49.00%
Sun care products | Sun and Skin Care | Product concentration risk | Percentage of Revenue
Derivative [Line Items]
Concentration risk, percentage		20.60%	21.50%	20.00%
Designated as hedging instrument | Cash flow hedging | FX contract
Derivative [Line Items]
Estimated fair value of derivatives	[1]	$ (1,400,000)	$ (2,400,000)
Open foreign currency contracts (in contracts) | contracts		64
Derivative, notional amount		$ 125,200,000
Not designated as hedging instrument | FX contract
Derivative [Line Items]
Estimated fair value of derivatives	[1]	$ 100,000	100,000
Open foreign currency contracts (in contracts) | contracts		1
Derivative, notional amount		$ 9,000,000.0
Change in estimate of fair value of foreign currency contracts		$ 600,000	$ 400,000	$ 3,000,000.0

[1] All derivative assets are presented in Other current assets or Other assets. All derivative liabilities are presented in Other current liabilities or Other liabilities.