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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2019	Oct. 31, 2018
Disaggregation Of Revenue [Line Items]
Contract asset	$ 29.8	$ 23.2
Transferred to accounts receivable	4.1
Contract liability	40.0	$ 28.1
Remaining performance obligations	328.2
Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Adjustment to net loss	$ 1.3

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