Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties
Unrecognized tax benefits, beginning balance	$ 96,363	$ 141,582	$ 30,668
Increase related to positions taken in prior period	1,959		122
Decrease related to positions taken in prior period		(46,400)
Increase related to positions taken in current period		2,482	111,412
Reductions related to settlements with taxing authorities	(1,224)
Reductions related to expiration of statute of limitations	(2,494)	(1,301)	(620)
Unrecognized tax benefits, ending balance	$ 94,604	$ 96,363	$ 141,582

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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