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Schedule of Net Amount Available Under Credit Facility (Detail) - Unsecured Credit Facility - USD ($)
Oct. 06, 2018
Dec. 30, 2017
Nov. 29, 2017
Debt Instrument [Line Items]      
Gross amount available $ 500,000,000   $ 700,000,000
Outstanding   $ 0  
Letters of credit (8,300,000)    
Available for withdrawal $ 491,700,000