Goodwill - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Mar. 31, 2026
Schedule Of Goodwill And Other Assets [Line Items]
Goodwill and other intangible assets, net	$ 562.3	$ 560.4
Operating Segments [Member] \| Product Manufacturing [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Goodwill impairment	$ 69.1

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.