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Fair Value of Financial Instruments - Narrative (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Jan. 28, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value Of Financial Instruments [Line Items]
Dividend income from equity investments		$ 5.0	$ 4.8
Common Stock
Fair Value Of Financial Instruments [Line Items]
Unrealized loss on investment		3.6
Dividend income from equity investments		$ 147.1
Shares of common stock held (in shares)		1.7
Global Auto Care
Fair Value Of Financial Instruments [Line Items]
Stock consideration, value	$ 242.1
Global Auto Care | Common Stock
Fair Value Of Financial Instruments [Line Items]
Stock consideration (in shares)	5.3

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