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Employee Benefit Plans (Details)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
plan
Jul. 31, 2020
USD ($)
Defined Benefit Plan Disclosure      
Number of U.S. plans | plan   2  
Annual company retirement contribution in addition to 401 (k) match, percent   3.00%  
Other comprehensive income (loss)   $ (143.0) $ (184.0)
Reclassification, Other      
Defined Benefit Plan Disclosure      
Curtailment charge $ 0.8    
Other comprehensive income (loss) $ 4.0