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Post Retirement Benefit Plans - Future Benefit Payments Next Five Years and Thereafter (Detail)
$ in Millions
Oct. 31, 2015
USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
2016 $ 41.6
2017 41.5
2018 42.5
2019 44.2
2020 44.7
2021-2025 237.1
Postretirement Health Care and Life Insurance Benefits [Member]  
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
2016 1.5
2017 1.4
2018 1.3
2019 1.2
2020 1.2
2021-2025 $ 5.3