Earnings Per Share (Schedule of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 74,667	$ 54,623
Basic:
Weighted average common shares (in shares)	48,476	47,674
Basic earnings per common share (in dollars per share)	$ 1.54	$ 1.15
Diluted:
Effect of dilutive stock options (in shares)	1,157	1,118
Diluted weighted average common shares (in shares)	49,633	48,792
Diluted earnings per common share (in dollars per share)	$ 1.50	$ 1.12