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Schedule of Net Amount Available Under Credit Facility (Detail) - Unsecured Credit Facility - USD ($)
Jul. 13, 2019
Dec. 29, 2018
Debt Instrument [Line Items]    
Gross amount available $ 500,000,000  
Outstanding (60,000,000) $ 0
Letters of credit (8,400,000)  
Line of credit facility, amount available $ 431,600,000