Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jul. 31, 2018	Oct. 31, 2017
Statement of Financial Position [Abstract]
Preferred Stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in USD per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	400,000,000	400,000,000
Common Stock, shares outstanding (in shares)	148,559,000	150,445,000
Treasury stock, shares (in shares)	8,701,000	6,817,000