Assumption Used in Option Valuation Model (Detail) (USD $)	12 Months Ended
	Oct. 31, 2012		Oct. 31, 2011		Oct. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life from the date of grant	5 years 7 months 6 days	[1]	5 years 7 months 6 days	[1]	5 years 7 months 6 days	[1]
Expected stock price volatility, minimum	41.60%	[2]	39.20%	[2]	38.50%	[2]
Expected stock price volatility, maximum			40.40%	[2]	39.00%	[2]
Risk-free interest rate, minimum	0.80%	[3]	1.00%	[3]	1.70%	[3]
Risk-free interest rate, maximum			2.10%	[3]	2.60%	[3]
Weighted average fair value of option grants	$ 5.25		$ 6.52		$ 6.37
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	3.00%	[4]	2.30%	[4]	2.60%	[4]
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield			2.60%	[4]	2.70%	[4]

[1] The expected life for options granted under the 2006 Equity Plan is based on observed historical exercise patterns of the previously granted options adjusted to reflect the change in vesting and expiration dates.

[2] The expected volatility is based on considerations of implied volatility from publicly traded and quoted options on the Company's common stock and the historical volatility of the Company's common stock.

[3] The risk-free interest rate is based on the continuous compounded yield on U.S. Treasury Constant Maturity Rates with a remaining term equal to the expected term of the option.

[4] The dividend yield is based on the historical dividend yield over the expected term of the options granted.