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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Revenue Recognition [Line Items] |  |  |
Contract costs, amortization period | 5 years |  |
Contract liabilities | $ 114.9 |  | $ 167.2
Contract with customer liability, revenue recognized | $ 130.6 | $ 133.2 |
Maximum |  |  |
Revenue Recognition [Line Items] |  |  |
Contract liabilities recognition service contract period | 1 year |  |
Delivery and Branch Expenses |  |  |
Revenue Recognition [Line Items] |  |  |
Amortization of deferred contract costs | $ 1.8 | $ 1.8 |
Prepaid Expense and Other Current Assets |  |  |
Revenue Recognition [Line Items] |  |  |
Deferred contract costs,current | 3.0 |  | 2.9
Deferred Charges and Other Assets, Net |  |  |
Revenue Recognition [Line Items] |  |  |
Deferred contract costs,non current | $ 4.8 |  | $ 4.5

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -SubTopic 40 -Topic 340 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-2 + Details
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