Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ 591	$ 973	$ (1,650)	$ 2,612
Income before income taxes	$ 137,725	$ 3,682	$ 197,872	$ 8,907
Effective tax rate	(0.40%)	26.40%	0.80%	29.30%
Income Tax Examination [Line Items]
Effective tax rate	(0.40%)	26.40%	0.80%	29.30%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent			28.10%
U.S. | Internal Revenue Service
Income Tax Examination [Line Items]
Tax contingency			$ 7,000