Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Number of Shares
Exercised	(570,425)	(850,855)	(494,843)
Employee Stock Options
Number of Shares
Outstanding at beginning of period	1,199,000
Granted	513,000
Exercised	(36,000)
Outstanding at end of period	1,676,000
Vested and exercisable at end of period	567,000
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	20.49
Granted	21.75
Exercised	18.97
Outstanding at end of period	20.91
Vested and exercisable at end of period	20.37
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	4.93
Vested and exercisable at end of period	3.22
Aggregate Intrinsic Value
Outstanding at end of period	1,063
Vested and exercisable at end of period	497
Time-Vested Plan
Number of Shares
Outstanding at beginning of period	701,000
Exercised	(111,000)
Forfeited or expired	(10,000)
Outstanding at end of period	580,000
Vested and exercisable at end of period	580,000
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	18.40
Exercised	16.49
Forfeited or expired	16.89
Outstanding at end of period	18.79
Vested and exercisable at end of period	18.79
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	2.9
Vested and exercisable at end of period	2.9
Aggregate Intrinsic Value
Outstanding at end of period	1,057
Vested and exercisable at end of period	1,057
1996 and 2002 Price-Vested Plans
Number of Shares
Outstanding at beginning of period	1,013,000
Exercised	(295,000)
Forfeited or expired	(8,000)
Outstanding at end of period	710,000
Vested and exercisable at end of period	710,000
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	17.43
Exercised	16.84
Forfeited or expired	15.16
Outstanding at end of period	17.71
Vested and exercisable at end of period	17.71
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	2.53
Vested and exercisable at end of period	2.53
Aggregate Intrinsic Value
Outstanding at end of period	1,793
Vested and exercisable at end of period	1,793
Executive Stock Option Plan (Age-Vested Plan)
Number of Shares
Outstanding at beginning of period	402,000
Exercised	(7,000)
Forfeited or expired	(35,000)
Outstanding at end of period	360,000
Vested and exercisable at end of period	80,000
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	13.75
Exercised	14.93
Forfeited or expired	14.01
Outstanding at end of period	13.70
Vested and exercisable at end of period	11.48
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	42.52
Vested and exercisable at end of period	43.20
Aggregate Intrinsic Value
Outstanding at end of period	2,346
Vested and exercisable at end of period	699