Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Earnings Per Share [Abstract]
Net income	$ 66,875	$ 44,217	$ 176,419	$ 118,792
Basic, Weighted average common shares	48,110	47,322	47,832	46,606
Basic earnings per common share	$ 1.39	$ 0.93	$ 3.69	$ 2.55
Effect of dilutive stock options	1,192	1,687	1,237	1,756
Diluted weighted average common shares	49,302	49,009	49,069	48,362
Diluted earnings per common share	$ 1.36	$ 0.90	$ 3.60	$ 2.46