Sale of Non-United States Accounts Receivable - Company's Accounts Receivables Programs (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2017
European RPA
Finance Receivable Transferred To Held For Sale [Line Items]
Gross accounts receivable sold to third party financial institution	$ 186.4	$ 176.5	$ 350.3	$ 314.1
Cash received for accounts receivable sold under the programs	165.2	156.2	310.8	278.2
Deferred purchase price related to accounts receivable sold	21.2	20.3	39.5	35.9
Loss associated with the programs	0.1	0.1	0.1	0.2
Expenses associated with the programs	0.0	0.0	0.0	0.0
Accounts receivable sold to and held by third party financial institution	134.9		134.9		$ 116.3
Deferred purchase price asset (liability) related to accounts receivable sold	19.8		19.8		(4.2)
Singapore RPA
Finance Receivable Transferred To Held For Sale [Line Items]
Gross accounts receivable sold to third party financial institution	16.3	15.1	27.1	25.0
Cash received for accounts receivable sold under the programs	14.0	13.7	22.9	21.7
Deferred purchase price related to accounts receivable sold	2.4	1.3	4.3	3.2
Loss associated with the programs	0.0	0.0	0.0	0.0
Expenses associated with the programs	0.0	0.0	0.0	0.0
Accounts receivable sold to and held by third party financial institution	6.4		6.4		3.8
Deferred purchase price asset (liability) related to accounts receivable sold	0.9		0.9		0.5
Total RPAs and Agreements
Finance Receivable Transferred To Held For Sale [Line Items]
Gross accounts receivable sold to third party financial institution	202.7	191.6	377.4	339.1
Cash received for accounts receivable sold under the programs	179.2	169.9	333.7	299.9
Deferred purchase price related to accounts receivable sold	23.6	21.6	43.8	39.1
Loss associated with the programs	0.1	0.1	0.1	0.2
Expenses associated with the programs	0.0	$ 0.0	0.0	$ 0.0
Accounts receivable sold to and held by third party financial institution	141.3		141.3		120.1
Deferred purchase price asset (liability) related to accounts receivable sold	$ 20.7		$ 20.7		$ (3.7)