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Earnings Per Share Calculation - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Numerator
Net income used to calculate Basic and Diluted EPS	$ 62,328	$ 33,616
Denominator
Basic weighted average shares outstanding (in shares)	154,334	156,314
Add: Shares underlying outstanding stock options and restricted stock units and issuable under employee stock purchase plan (in shares)	1,404	1,860
Dilutive weighted average shares outstanding (in shares)	155,738	158,174
EPS
Basic EPS (in dollars per share)	$ 0.40	$ 0.22
Diluted EPS (in dollars per share)	$ 0.40	$ 0.21

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