Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jul. 01, 2025	Sep. 30, 2023
Goodwill [Line Items]
Goodwill, gross	$ 1,713,200,000	$ 1,709,600,000		$ 1,702,400,000
Goodwill, accumulated impairment loss	(422,100,000)	(371,000,000.0)		(371,000,000.0)
Goodwill [Roll Forward]
Net balance at October 1, 2023	1,338,600,000	1,331,400,000
Cumulative translation adjustment	3,600,000	7,200,000
Net balance at October 1, 2024	1,291,100,000	1,338,600,000
Goodwill, Impairment Loss	51,100,000
Wet Shave
Goodwill [Line Items]
Goodwill, gross	1,150,600,000	1,146,000,000		1,140,500,000
Goodwill, accumulated impairment loss	(369,000,000.0)	(369,000,000.0)		(369,000,000.0)
Goodwill [Roll Forward]
Net balance at October 1, 2023	777,000,000.0	771,500,000
Cumulative translation adjustment	4,600,000	5,500,000
Net balance at October 1, 2024	$ 781,600,000	777,000,000.0
Excess of FV over Carrying Value	7.00%		15.00%
Sun and Skin Care
Goodwill [Line Items]
Goodwill, gross	$ 357,500,000	357,400,000		355,900,000
Goodwill, accumulated impairment loss	(2,000,000.0)	(2,000,000.0)		(2,000,000.0)
Goodwill [Roll Forward]
Net balance at October 1, 2023	355,400,000	353,900,000
Cumulative translation adjustment	100,000	1,500,000
Net balance at October 1, 2024	$ 355,500,000	355,400,000
Excess of FV over Carrying Value	16.00%		13.00%
Feminine Care
Goodwill [Line Items]
Goodwill, gross	$ 205,100,000	206,200,000		206,000,000.0
Goodwill, accumulated impairment loss	(51,100,000)	0		$ 0
Goodwill [Roll Forward]
Net balance at October 1, 2023	206,200,000	206,000,000.0
Cumulative translation adjustment	(1,100,000)	200,000
Net balance at October 1, 2024	$ 154,000,000.0	$ 206,200,000
Excess of Carrying Value over Fair Value	13.70%