Stock Issuance and Stock Repurchase Program (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Apr. 30, 2014	Jan. 31, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Nov. 07, 2013	Mar. 31, 2003
Share Repurchase Program
Number of shares purchased	3,000		3,000	5,000	5,000
Average price per share	$ 36.04		$ 34.49	$ 34.71	$ 33.61
Remaining authorization at April 30:	8,263,000		8,760,000	8,263,000	8,760,000
Stock Issuance and Stock Repurchase Program (Textual) [Abstract]
Stock Issued During Period, Shares, New Issues		7,200,000
Par value of common stock repurchased						$ 0.01	$ 0.01
Sale of Stock, Price Per Share						$ 32.00
Proceeds from Issuance of Common Stock				$ 220,357
Stock Repurchase Program, Number of Shares Authorized to be Repurchased							20,000,000