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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Revenue Recognition [Line Items]
Contract costs, amortization period	5 years
Contract liabilities	$ 99.6		$ 139.6
Contract with customer liability, revenue recognized	$ 107.2	$ 95.7
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	$ 2.0	$ 1.9
Prepaid Expense and Other Current Assets
Revenue Recognition [Line Items]
Deferred contract costs,current	3.5		3.4
Deferred Charges and Other Assets, Net
Revenue Recognition [Line Items]
Deferred contract costs,non current	$ 6.2		$ 5.9

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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-Publisher FASB
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-Section 50
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+ References

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