Stockholders' Equity (Details)					3 Months Ended		12 Months Ended
	Aug. 07, 2017 USD ($) $ / shares	Feb. 09, 2017 USD ($) $ / shares	Aug. 05, 2016 USD ($) $ / shares	Feb. 09, 2016 USD ($) $ / shares	Oct. 31, 2017 USD ($) $ / shares shares	Apr. 30, 2017 USD ($) $ / shares shares	Oct. 31, 2017 USD ($) shares	Oct. 31, 2016 USD ($) shares	Oct. 31, 2015 USD ($)	Mar. 01, 2017 USD ($)	Feb. 28, 2017 USD ($)
Equity [Abstract]
Share repurchase program, maximum amount authorized										$ 1,000,000,000.0	$ 500,000,000.0
Number of shares purchased | shares					108,000	150,000	257,500	0
Cost of common stock repurchased					$ 25,500,000	$ 29,500,000	$ 55,000,000		$ 67,300,000
Share repurchase program, remaining authorized amount					$ 563,500,000		563,500,000
Average purchase price per share (usd per share) | $ / shares					$ 237.12	$ 196.82
Dividends on common stock	$ 1,500,000	$ 1,500,000	$ 1,500,000	$ 1,400,000			$ 2,900,000	$ 2,900,000	$ 2,900,000
Cash dividend, per share (usd per share) | $ / shares	$ 0.03	$ 0.03	$ 0.03	$ 0.03
Date of record	Jul. 21, 2017	Jan. 23, 2017	Jul. 22, 2016	Jan. 22, 2016
Common stock purchase right versus preferred share purchase right							0.5