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Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 14,443	$ 2,176	$ 14,408	$ 1,894
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring	14,700	1,800	14,700	1,800
Employee related restructuring liabilities	6,800		6,800		$ 8,100
Minimum | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	35,000	8,000	35,000	8,000
Maximum | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 65,000	$ 10,000	$ 65,000	$ 10,000

X

- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

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