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Contingencies (Details) - USD ($)
$ in Millions
9 Months Ended 37 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Apr. 24, 2018
Sep. 30, 2020
Apr. 30, 2022
Jun. 30, 2018
Loss Contingencies [Line Items]              
Loss contingency, possible loss suspension         $ 15.0    
Other Current Liabilities              
Loss Contingencies [Line Items]              
Loss contingency accrual         3.5    
Other Noncurrent Liabilities              
Loss Contingencies [Line Items]              
Loss contingency accrual         3.5    
Civil Penalty              
Loss Contingencies [Line Items]              
Litigation settlement payment $ 3.5 $ 3.5 $ 1.0        
Loss contingency accrual         7.0   $ 15.0
Civil Penalty | Maximum              
Loss Contingencies [Line Items]              
Loss contingency, estimate of possible loss       $ 30.0      
Loss contingency, possible loss suspension       $ 15.0      
Product Quality Matters | Other Current Liabilities              
Loss Contingencies [Line Items]              
Loss contingency accrual         2.7    
Product Quality Matters | Minimum              
Loss Contingencies [Line Items]              
Loss contingency, estimate of possible loss         2.7    
Product Quality Matters | Maximum              
Loss Contingencies [Line Items]              
Loss contingency, estimate of possible loss         $ 9.1    
Subsequent Event              
Loss Contingencies [Line Items]              
Litigation settlement payment           $ 3.5