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Post Retirement Benefit Plans - Future Benefit Payments Next Five Years and Thereafter (Detail)
$ in Millions
Oct. 31, 2016
USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
2017 $ 42.2
2018 42.3
2019 43.9
2020 44.5
2021 44.4
2022-2026 242.7
Postretirement Health Care and Life Insurance Benefits  
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
2017 1.3
2018 1.3
2019 1.2
2020 1.1
2021 1.1
2022-2026 $ 4.7