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Finance Receivables (Narrative) (Detail) - USD ($)
9 Months Ended
Sep. 24, 2017
Dec. 31, 2016
Sep. 25, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment $ 0 $ 0 $ 0
Wholesale      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment 0 0 0
Finance receivables, gross, 90 days or more past due and accruing interest 1,300,000 300,000 400,000
Wholesale receivables on non-accrual status 0 0 0
Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Individually evaluated for impairment $ 0 0 0
Threshold period past due to be charged-off 120 days    
Finance receivables, gross, 90 days or more past due and accruing interest $ 32,700,000 $ 40,400,000 $ 31,300,000