Share-Based Compensation Expense - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Summary of Restricted Stock Unit Activity
Restricted shares outstanding, Beginning balance (in shares)	4,402
Restricted stock units outstanding, granted (in shares)	2,057
Restricted stock units outstanding, vested (in shares)	(2,101)
Restricted stock units outstanding, canceled or forfeited (in shares)	(348)
Restricted shares outstanding, Ending balance (in shares)	4,010
Weighted average grant date fair value per share (in dollars per share)	$ 27.94	$ 22.26
Aggregate fair value	$ 146,091	$ 140,943