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Schedule of Net Amount Available Under Credit Facility (Detail) - Unsecured Credit Facility - USD ($)
Apr. 20, 2019
Dec. 29, 2018
Nov. 29, 2017
Debt Instrument [Line Items]      
Gross amount available $ 500,000,000   $ 700,000,000.0
Outstanding (121,000,000) $ 0  
Letters of credit (8,400,000)    
Line of credit facility, amount available $ 370,600,000