Goodwill and Intangible Assets, net - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 14.1	$ 14.8

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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