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Contingencies (Minimum Self Insurance Payments) (Details)
$ in Thousands
Jan. 31, 2018
USD ($)
Self Insurance, Future Estimated Payments Due  
Estimated self insurance payments due in 2019 $ 300
Estimated self insurance payments due in 2020 300
Estimated self insurance payments due in 2021 300
Estimated self insurance payments due in 2022 300
Estimated self insurance payments due in 2023 215
Estimated self insurance payments due thereafter 0
Estimated self insurance payments, gross 1,415
Discount to net present value (40)
Estimated self insurance payments, net $ 1,375