Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Number of Shares
Exercised	(967,123)	(570,425)	(850,855)
Time Vested, Price Vested, Age Vested
Number of Shares
Outstanding at beginning of period	1,650,000
Exercised	(517,000)
Forfeited or expired	(16,000)
Outstanding at end of period	1,117,000
Vested and exercisable at end of period	849,000
Aggregate Intrinsic Value
Outstanding at end of period	2,354
Vested and exercisable at end of period	1,156
Time Vested, Price Vested, Age Vested | Minimum
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	13.70
Exercised	15.29
Forfeited or expired	5.63
Outstanding at end of period	13.80
Vested and exercisable at end of period	11.36
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	2 years 3 months 18 days
Vested and exercisable at end of period	2 years 3 months 18 days
Time Vested, Price Vested, Age Vested | Maximum
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	18.79
Exercised	17.15
Forfeited or expired	19.76
Outstanding at end of period	19.61
Vested and exercisable at end of period	19.61
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	41 years 9 months
Vested and exercisable at end of period	42 years 3 months 18 days
Employee Stock Options
Number of Shares
Outstanding at beginning of period	1,676,000
Granted	231,000
Forfeitures	(110,000)
Exercised	(104,000)
Outstanding at end of period	1,693,000
Vested and exercisable at end of period	712,000
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	20.91
Granted	18.31
Forfeitures	20.62
Exercised	19.23
Outstanding at end of period	20.68
Vested and exercisable at end of period	20.27
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	4 years 4 months 21 days
Vested and exercisable at end of period	2 years 10 months 10 days
Aggregate Intrinsic Value
Outstanding at end of period	285
Vested and exercisable at end of period	98