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Post Retirement Benefit Plans - Actuarial Assumptions Used for the Measurement of Benefit Obligations and Pension Costs (Detail) (Postretirement Health Care and Life Insurance Benefits [Member])
Oct. 31, 2012
Oct. 31, 2011
Pension Plans, Defined Benefit [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs 4.77% 5.56%
USA [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs 4.00% 4.90%
South Africa [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs 7.75% 8.25%