Restricted Stock Activity (Detail) (Restricted Stock Units (RSUs), USD $)	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009	Oct. 31, 2008	Oct. 31, 2007
Restricted Stock Units (RSUs)
Number of Shares
Outstanding at beginning of period	566,513	492,948	479,500	409,674	388,950	379,000
Granted during fiscal 2007	118,175	112,025	127,150	78,826	45,209	15,000
Vested during 2007	(81,819)	(35,193)	(96,838)	(9,000)	(21,000)	0
Forfeited during 2007	(14,669)	(3,267)	(16,864)	0	(3,485)	(5,050)
Outstanding at end of period	588,200	566,513	492,948	479,500	409,674	388,950
Weighted Average Grant Price
Outstanding at beginning of period	$ 42.44	$ 41.98	$ 41.22	$ 41.86	$ 42.79	$ 43.81
Granted during fiscal 2007	$ 48.50	$ 43.70	$ 40.80	$ 36.12	$ 35.00	$ 33.70
Vested during 2007	$ 39.97	$ 40.21	$ 36.93	$ 25.53	$ 44.56	$ 0.00
Forfeited during 2007	$ 43.32	$ 40.10	$ 38.99	$ 0.00	$ 41.36	$ 42.62
Outstanding at end of period	$ 48.40	$ 42.44	$ 41.98	$ 41.22	$ 41.86	$ 42.79