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Intangible Assets (Narrative) (Details)
3 Months Ended
Apr. 30, 2019
USD ($)
reporting_unit
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Oct. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Goodwill, Impairment Loss   $ 0 $ 0  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Remainder of 2019 $ 71,800,000      
2020 135,500,000      
2021 134,200,000      
2022 132,400,000      
2023 130,100,000      
Thereafter 861,200,000      
Intangible assets with definite lives, net $ 1,465,200,000     $ 1,512,400,000
CooperSurgical        
Finite-Lived Intangible Assets [Line Items]        
Number of reporting units | reporting_unit 2