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Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Revenue Recognition [Line Items]      
Contract costs, amortization period 5 years    
Contract liabilities $ 161.9   $ 170.3
Contract with customer liability, revenue recognized $ 91.6 $ 85.6  
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 $ 1.0 $ 1.0  
Prepaid Expense and Other Current Assets      
Revenue Recognition [Line Items]      
Deferred contract costs,current 3.3   3.3
Deferred Charges and Other Assets, Net      
Revenue Recognition [Line Items]      
Deferred contract costs,non current $ 5.6   $ 5.4