Earnings Per Share (Schedule of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 79,160	$ 75,136	$ 151,003	$ 149,803
Basic:
Weighted average common shares (in shares)	47,919	48,494	47,963	48,485
Basic earnings per common share (in dollars per share)	$ 1.65	$ 1.55	$ 3.15	$ 3.09
Diluted:
Effect of dilutive stock options (in shares)	835	984	920	1,070
Diluted weighted average common shares (in shares)	48,754	49,478	48,883	49,555
Diluted earnings per common share (in dollars per share)	$ 1.62	$ 1.52	$ 3.09	$ 3.02