Target Allocation Ranges And Asset Allocations (Detail)	12 Months Ended
	Oct. 31, 2012
Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation Equity, minimum	43.00%
Target Allocation Equity, maximum	63.00%
Target Allocation Equity	55.00%
Debt Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation Equity, minimum	27.00%
Target Allocation Equity, maximum	47.00%
Target Allocation Equity	37.00%
International Equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation Equity, minimum	0.00%
Target Allocation Equity, maximum	20.00%
Target Allocation Equity	8.00%