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Recently Adopted Accounting Standards - Additional Information (Detail)
 9 Months Ended
Apr. 25, 2020
Jan. 24, 2020
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]    
Change in accounting principle, accounting standards update, adopted [true false] true  
Change in accounting principle, accounting standards update, adoption date Apr. 25, 2020  
Change in accounting principle, accounting standards update, immaterial effect [true false] true  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201602Member