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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Revenue Recognition [Line Items] |  |  |
Contract costs, amortization period | 5 years |  |
Contract liabilities | $ 106.8 |  | $ 139.6
Contract with customer liability, revenue recognized | $ 122.2 | $ 110.0 |
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 | $ 2.9 | $ 3.0 |
Prepaid Expense and Other Current Assets |  |  |
Revenue Recognition [Line Items] |  |  |
Deferred contract costs,current | 3.4 |  | 3.4
Deferred Charges and Other Assets, Net |  |  |
Revenue Recognition [Line Items] |  |  |
Deferred contract costs,non current | $ 5.9 |  | $ 5.9

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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