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Fair Value Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2020
Oct. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Asset Impairment Charges [Abstract]          
Goodwill impairment charge $ 1.2 $ 45.8 $ 47.0 $ 0.0 $ 0.0
Asset based revolving line of credit          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Amount outstanding 0.0   0.0 0.0  
Fair Value, Inputs, Level 2          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Senior secured notes, fair value 202.5   202.5 $ 254.1  
Fair Value, Inputs, Level 3          
Assets, Fair Value Disclosure [Abstract]          
Goodwill fair value $ 28.3   $ 28.3