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Short-term and Long-term Debt - Narrative (Detail)
9 Months Ended
Apr. 30, 2020
USD ($)
Sep. 26, 2020
USD ($)
revision
Sep. 28, 2019
USD ($)
Dec. 28, 2019
USD ($)
Sep. 16, 2019
USD ($)
Schedule Of Debt Instruments [Line Items]          
Notes payable and current maturities of long-term debt   $ 267,900,000   $ 202,900,000  
Commercial paper outstanding       193,600,000  
Other notes payable       $ 9,300,000  
Proceeds from issuance of long-term debt   489,900,000 $ 0    
Other notes          
Schedule Of Debt Instruments [Line Items]          
Short-term debt   14,300,000      
Note Payable, Debt Amortization Costs And Fair Value Adjustments Of Interest Rate Swaps          
Schedule Of Debt Instruments [Line Items]          
Short-term debt   $ 3,600,000      
6.125% unsecured notes due 2021          
Schedule Of Debt Instruments [Line Items]          
Unsecured notes, interest rate   6.125%      
6.125% unsecured notes due 2021 | Unsecured Debt          
Schedule Of Debt Instruments [Line Items]          
Debt instrument, face amount   $ 250,000,000.0      
3.10% unsecured notes due 2050          
Schedule Of Debt Instruments [Line Items]          
Unsecured notes, interest rate   3.10%      
3.10% unsecured notes due 2050 | Unsecured Debt          
Schedule Of Debt Instruments [Line Items]          
Debt instrument, face amount $ 500,000,000        
Unsecured notes, interest rate 3.10%        
Proceeds from issuance of long-term debt $ 489,900,000        
Payments of financing costs $ 4,400,000        
Five-year Multi-Currency Revolving Credit Facility | Revolving Credit Facility | Line of Credit          
Schedule Of Debt Instruments [Line Items]          
Revolving credit facility, amount available         $ 800,000,000
Credit Facility borrowings   $ 0      
Number of allowed revisions to debt ratios | revision   2      
Debt maturity, term   5 years      
Actual debt-to-capital ratio   0.15      
Actual debt-to-income ratio   0.73      
Five-year Multi-Currency Revolving Credit Facility | Revolving Credit Facility | Maximum | Line of Credit          
Schedule Of Debt Instruments [Line Items]          
Maximum limit of required debt-to-capital ratio   0.60      
Maximum limit of required debt-to-income ratio   3.50      
Five-year Multi-Currency Revolving Credit Facility | Revolving Credit Facility | Maximum | Material Acquisition | Line of Credit          
Schedule Of Debt Instruments [Line Items]          
Maximum limit of required debt-to-capital ratio   0.65      
Maximum limit of required debt-to-income ratio   4.00