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Debt (Detail) - USD ($)
3 Months Ended 6 Months Ended
Dec. 27, 2019
Dec. 31, 2018
Dec. 27, 2019
Dec. 31, 2018
Sep. 28, 2018
Debt Instrument [Line Items]          
Interest expense $ 0 $ 2,196,000 $ 0 $ 4,455,000  
Amount of outstanding letter of credit 1,106,000   1,106,000    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 750,000,000
Term Loan          
Debt Instrument [Line Items]          
Debt issuance costs $ 5,041,000   $ 5,041,000