Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
Apr. 30, 2019	Oct. 31, 2018
Disaggregation Of Revenue [Line Items]
Contract asset	$ 25.5	$ 23.2
Transferred to accounts receivable	4.1
Contract liability	38.8	$ 28.1
Remaining performance obligations	321.6
Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Adjustment to net loss	$ 1.3

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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