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Post Retirement Benefit Plans - Weighted Average Asset Allocations at Measurement Date and Target Asset Allocations (Detail)
12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Total, Target 100.00% 100.00%
Total, Actual 100.00% 100.00%
Equity Securities [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Total, Target 23.00% 24.00%
Total, Actual 28.00% 28.00%
Debt Securities [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Total, Target 51.00% 49.00%
Total, Actual 40.00% 39.00%
Other Debt Obligations [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Total, Target 26.00% 27.00%
Total, Actual 32.00% 33.00%