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Selected Quarterly Financial Data (Unaudited) - Footnote Disclosure (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 30, 2020
USD ($)
$ / shares
Quarterly Financial Information Disclosure [Abstract]  
Goodwill and intangible asset impairment $ 172.8
Goodwill and intangible asset impairment, after tax $ 170.6
Goodwill and intangible asset impairment (usd per share) | $ / shares $ 2.54