Stockholders' Equity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended			3 Months Ended		9 Months Ended
	Aug. 06, 2012	Feb. 07, 2012	Dec. 15, 2011	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2012	Jul. 31, 2011
Stockholders' Equity Note [Abstract]
Share Repurchase Program, maximum amount authorized			$ 150,000,000
Number of common stock repurchased, shares				321	663	984
Cost of common stock repurchased				25,000,000	46,100,000	71,100,000
Share Repurchase Program, remaining authorized amount						78,900,000
Average purchase price per share				$ 77.89	$ 69.60
Dividends on common stock	$ 1,400,000	$ 1,400,000				$ 1,421,000	$ 1,385,000
Cash dividend, per share	$ 0.03	$ 0.03
Dividends payable, date of record	Jul. 24, 2012	Jan. 25, 2012