Finance Receivables (Changes In Allowance For Credit Losses On Finance Receivables) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2017	Mar. 27, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 173,343	$ 147,178
Provision for credit losses	43,589	37,123
Charge-offs	(45,924)	(39,644)
Recoveries	13,022	11,527
Balance, end of period	184,030	156,184
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	212,764	0	$ 236,706
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	5,867,143	5,868,921	$ 5,839,467
Variable Interest Entity, Not Primary Beneficiary | Asset-backed securitization debt
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Principal balance of finance receivable	301,800
Retail
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	166,810	139,320
Provision for credit losses	42,160	35,524
Charge-offs	(45,924)	(39,644)
Recoveries	13,022	11,527
Balance, end of period	176,068	146,727
Wholesale
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	6,533	7,858
Provision for credit losses	1,429	1,599
Charge-offs	0	0
Recoveries	0	0
Balance, end of period	$ 7,962	$ 9,457