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Financing Arrangements - Narrative (Details) - Line of Credit - USD ($)
12 Months Ended
Jul. 31, 2018
Jun. 28, 2018
Jul. 31, 2017
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 300,000,000  
Fees on unused portion of credit facilities (as a percent) 0.20%    
Shares of foreign subsidiaries pledged as security (as a percent) 65.00%    
Write-off of debt financing costs $ 127,000    
Minimum      
Debt Instrument [Line Items]      
Fees on unused portion of credit facilities (as a percent) 0.20%    
Maximum      
Debt Instrument [Line Items]      
Fees on unused portion of credit facilities (as a percent) 0.35%    
Lender's base rate      
Debt Instrument [Line Items]      
Margin on reference rate (as a percent) 0.25%    
Reference rate (as a percent) 5.00%    
Lender's base rate | Minimum      
Debt Instrument [Line Items]      
Margin on reference rate (as a percent) 0.00%    
Lender's base rate | Maximum      
Debt Instrument [Line Items]      
Margin on reference rate (as a percent) 1.00%    
LIBOR      
Debt Instrument [Line Items]      
Margin on reference rate (as a percent) 1.25%    
LIBOR | Minimum      
Debt Instrument [Line Items]      
Margin on reference rate (as a percent) 1.00%    
Reference rate (as a percent) 1.25%    
LIBOR | Maximum      
Debt Instrument [Line Items]      
Margin on reference rate (as a percent) 2.00%    
Tranche A term loan      
Debt Instrument [Line Items]      
Revolving credit loans outstanding $ 200,000,000 200,000,000 $ 0
Debt Instrument, Face Amount 200,000,000    
Principal amortization, periodic payment due 2019, 2020, 2021, and 2022 10,000,000    
Balance due and payable at maturity in 2023 $ 160,000,000    
Interest rate (as a percent) 3.35%    
Revolving credit loan      
Debt Instrument [Line Items]      
Revolving credit loans outstanding $ 0 $ 400,000,000 $ 126,000,000
Revolving credit loan | Minimum      
Debt Instrument [Line Items]      
Fees on unused portion of credit facilities (as a percent) 0.20%    
Revolving credit loan | Maximum      
Debt Instrument [Line Items]      
Fees on unused portion of credit facilities (as a percent) 0.35%