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v3.25.3

Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
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Sep. 30, 2025 USD ($) reporting_unit numberOfPrincipalActivities | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Apr. 16, 2024 USD ($)
Property, Plant, and Equipment |  |  |  |
Investment interest income |  | $ 15,900,000 | $ 44,000,000.0 |
Capitalized cloud computing arrangements | $ 37,500,000 | 33,100,000 |  |
Amortization expense for capitalized computer implementation costs | $ 6,600,000 | 4,200,000 | 3,300,000 |
Number of reporting units | reporting_unit | 1 |  |  |
Number of principal activities | numberOfPrincipalActivities | 2 |  |  |
Customer incentives | $ 238,900,000 | 222,600,000 | 190,300,000 |
Advertising | 74,300,000 | $ 69,400,000 | $ 60,500,000 |
Excise tax on share repurchases | $ 16,400,000 |  |  |
Transferred at Point in Time |  |  |  |
Property, Plant, and Equipment |  |  |  |
Percentage of revenue recognized | 95.00% |  |  |
Minimum |  |  |  |
Property, Plant, and Equipment |  |  |  |
Lease term (less than one year, more than 20 years) | 5 years |  |  |
Payment terms | 30 days |  |  |
Expected timing of satisfaction for revenue performance obligations | 10 years |  |  |
Maximum |  |  |  |
Property, Plant, and Equipment |  |  |  |
Lease term (less than one year, more than 20 years) | 20 years |  |  |
Payment terms | 60 days |  |  |
Expected timing of satisfaction for revenue performance obligations | 15 years |  |  |
Buildings | Minimum |  |  |  |
Property, Plant, and Equipment |  |  |  |
Estimated useful life of property, plant and equipment | 7 years |  |  |
Buildings | Maximum |  |  |  |
Property, Plant, and Equipment |  |  |  |
Estimated useful life of property, plant and equipment | 20 years |  |  |
Machinery and equipment | Minimum |  |  |  |
Property, Plant, and Equipment |  |  |  |
Estimated useful life of property, plant and equipment | 5 years |  |  |
Machinery and equipment | Maximum |  |  |  |
Property, Plant, and Equipment |  |  |  |
Estimated useful life of property, plant and equipment | 7 years |  |  |
2030 Notes | Senior Notes |  |  |  |
Property, Plant, and Equipment |  |  |  |
Interest rate of debt |  |  |  | 4.25%
Aggregate principal amount |  |  |  | $ 600,000,000.0

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