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Employee Benefit Plans (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2020
USD ($)
plan
Apr. 30, 2019
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2019
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%      
Settlement charge   $ 2.3 $ 0.0 $ 2.3 $ 0.0    
Accumulated other comprehensive loss   (212.1)   (212.1)     $ (192.9)
Pension Plan | United States              
Defined Benefit Plan Disclosure              
Minimum funding requirement           $ 4.4  
Company contributions   3.5          
Pension Plan | United States | Subsequent Event              
Defined Benefit Plan Disclosure              
Company contributions $ 0.5            
Pension Plan | Foreign Plan              
Defined Benefit Plan Disclosure              
Company contributions   1.4   1.0      
Estimated future contributions to pension plans   0.1   0.1      
Reclassification              
Defined Benefit Plan Disclosure              
Accumulated other comprehensive loss   $ 7.9   $ 7.9