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Schedule II-Valuation and Qualifying Accounts (Detail) - Accounts receivable allowances - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Year $ 18.1 [1] $ 8.6 $ 9.2
Charges to Costs and Expenses 47.4 [1] 29.1 17.2
Write-offs/Allowance Taken [2] (40.0) (19.6) (17.8)
Balance End of Year $ 25.5 $ 18.1 [1] $ 8.6
[1] Includes amounts that were classified as held for sale.
[2] Write-offs are net of recoveries.