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Financing Arrangements - Narrative (Details) - USD ($)
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jun. 28, 2018
Debt Instrument [Line Items]        
Principal payment made $ 15,207,000 $ 0 $ 0  
Line of Credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 300,000,000
Consolidated Leverage Ratio 1.26      
Shares of foreign subsidiaries pledged as security (as a percent) 65.00%      
Line of Credit | Minimum        
Debt Instrument [Line Items]        
Fees on unused portion of credit facilities (as a percent) 0.20%      
Line of Credit | Maximum        
Debt Instrument [Line Items]        
Fees on unused portion of credit facilities (as a percent) 0.35%      
Line of Credit | Lender's base rate        
Debt Instrument [Line Items]        
Margin on reference rate (as a percent) 0.25%      
Reference rate (as a percent) 5.50%      
Line of Credit | Lender's base rate | Minimum        
Debt Instrument [Line Items]        
Margin on reference rate (as a percent) 0.00%      
Line of Credit | Lender's base rate | Maximum        
Debt Instrument [Line Items]        
Margin on reference rate (as a percent) 1.00%      
Line of Credit | LIBOR        
Debt Instrument [Line Items]        
Margin on reference rate (as a percent) 1.25%      
Line of Credit | LIBOR | Minimum        
Debt Instrument [Line Items]        
Margin on reference rate (as a percent) 1.00%      
Reference rate (as a percent) 2.23%      
Line of Credit | LIBOR | Maximum        
Debt Instrument [Line Items]        
Margin on reference rate (as a percent) 2.00%      
Line of Credit | Tranche A term loan        
Debt Instrument [Line Items]        
Revolving credit loans outstanding $ 190,000,000 200,000,000   200,000,000
Borrowings outstanding 190,000,000      
Principal amortization, periodic payment due 2019, 2020, 2021, and 2022 10,000,000      
Balance due and payable at maturity in 2023 160,000,000      
Principal payment made $ 10,000,000      
Interest rate (as a percent) 3.48%      
Line of Credit | Revolving credit loan        
Debt Instrument [Line Items]        
Revolving credit loans outstanding $ 43,000,000 $ 0   $ 400,000,000
Line of Credit | Revolving credit loan | Minimum        
Debt Instrument [Line Items]        
Fees on unused portion of credit facilities (as a percent) 0.20%      
Line of Credit | Revolving credit loan | Maximum        
Debt Instrument [Line Items]        
Fees on unused portion of credit facilities (as a percent) 0.35%      
Omnia Debt Acquired        
Debt Instrument [Line Items]        
Principal payment made $ 5,207,000