Stockholders' Equity (Details)					3 Months Ended				12 Months Ended
	Aug. 06, 2015 USD ($) $ / shares	Feb. 09, 2015 USD ($) $ / shares	Aug. 07, 2014 USD ($) $ / shares	Feb. 07, 2014 USD ($) $ / shares	Oct. 31, 2015 USD ($) $ / shares shares	Jul. 31, 2015 shares	Apr. 30, 2015 shares	Jan. 31, 2015 USD ($) $ / shares shares	Oct. 31, 2015 USD ($) $ / shares shares	Oct. 31, 2014 USD ($) $ / shares shares	Oct. 31, 2013 USD ($) shares	Dec. 15, 2011 USD ($)
Equity [Abstract]
Share repurchase program, maximum amount authorized												$ 500,000,000
Number of shares purchased | shares					368,000	0	0	100,000	467,539	571,939	1,400,000
Cost of common stock repurchased					$ 51,300,000			$ 16,000,000	$ 67,304,000	$ 75,778,000	$ 167,334,000
Share repurchase program, remaining authorized amount					$ 118,400,000				118,400,000
Average purchase price per share (usd per share) | $ / shares					$ 139.60			$ 159.96
Dividends on common stock	$ 1,500,000	$ 1,400,000	$ 1,500,000	$ 1,400,000					$ 2,906,000	$ 2,884,000	$ 2,918,000
Cash dividend, per share (usd per share) | $ / shares	$ 0.03	$ 0.03	$ 0.03	$ 0.03					$ 0.03
Date of record	Jul. 24, 2015	Jan. 23, 2015	Jul. 24, 2014	Jan. 24, 2014
Common stock purchase right versus preferred share purchase right									0.5
Percentage of acquisition of beneficial ownership									20.00%
Purchase price of the Right, subject to adjustment (usd per right)									$ 450
Percentage of assets or earning power sold									50.00%
Board of Directors may redeem the rights at, price per right | $ / shares										$ 0.01