Restricted Stock Activity (Detail) (Restricted Stock Units (RSUs), USD $)	12 Months Ended
	Oct. 31, 2013	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	588,200	566,513	492,948	479,500	409,674	388,950	379,000
Granted during fiscal period	78,700	118,175	112,025	127,150	78,826	45,209	15,000
Vested during period	(87,431)	(81,819)	(35,193)	(96,838)	(9,000)	(21,000)	0
Forfeited during period	(10,844)	(14,669)	(3,267)	(16,864)	0	(3,485)	(5,050)
Outstanding at end of period	568,625	588,200	566,513	492,948	479,500	409,674	388,950
Weighted Average Grant Price
Outstanding at beginning of period	$ 43.98	$ 42.44	$ 41.98	$ 41.22	$ 41.86	$ 42.79	$ 43.81
Granted during fiscal period	$ 48.50	$ 48.50	$ 43.70	$ 40.80	$ 36.12	$ 35.00	$ 33.70
Vested during the period	$ 42.26	$ 39.97	$ 40.21	$ 36.93	$ 25.53	$ 44.56	$ 0.00
Forfeited during the period	$ 45.30	$ 43.32	$ 40.10	$ 38.99	$ 0.00	$ 41.36	$ 42.62
Outstanding at end of period	$ 44.85	$ 43.98	$ 42.44	$ 41.98	$ 41.22	$ 41.86	$ 42.79