Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Number of Shares
Exercised	(1,031,867)	(967,123)	(570,425)
Age-Vested, Time-Vested, Price-Vested
Number of Shares
Outstanding at beginning of period	1,117,000
Exercised	(298,000)
Forfeited or expired	(34,000)
Outstanding at end of period	785,000
Vested and exercisable at end of period	564,000
Aggregate Intrinsic Value
Outstanding at end of period	$ 8,005
Vested and exercisable at end of period	5,104
Age-Vested, Time-Vested, Price-Vested | Minimum
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	$ 13.80
Exercised	$ 15.04
Forfeited or expired	$ 15.94
Outstanding at end of period	$ 13.66
Vested and exercisable at end of period	$ 11.94
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	1 year 7 months 6 days
Vested and exercisable at end of period	1 year 7 months 6 days
Age-Vested, Time-Vested, Price-Vested | Maximum
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	$ 19.61
Exercised	$ 18.30
Forfeited or expired	$ 20.12
Outstanding at end of period	$ 20.60
Vested and exercisable at end of period	$ 20.60
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	41 years 2 months 1 day
Vested and exercisable at end of period	45 years 5 months 9 days
Stock options
Number of Shares
Outstanding at beginning of period	1,693,000
Granted	234,000
Forfeitures	(14,000)
Exercised	(351,000)
Outstanding at end of period	1,562,000
Vested and exercisable at end of period	565,000
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	$ 20.68
Granted	$ 25.30
Forfeitures	$ 19.89
Exercised	$ 19.80
Outstanding at end of period	$ 21.57
Vested and exercisable at end of period	$ 20.22
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	4 years 3 months 18 days
Vested and exercisable at end of period	3 years 4 months
Aggregate Intrinsic Value
Outstanding at end of period	9,277
Vested and exercisable at end of period	$ 4,124