Finance Receivables (Changes In Allowance For Credit Losses On Finance Receivables) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period			$ 147,178	$ 127,364
Provision for credit losses	$ 36,543	$ 27,233	97,127	68,655
Charge-offs	(35,749)	(30,203)	(101,853)	(83,939)
Recoveries	9,369	9,122	32,355	33,303
Other			(3,291)
Balance, end of period	171,516	145,383	171,516	145,383
Current unpaid balance - off-balance sheet retail motorcycle finance receivables	262,583	0	262,583	0	$ 0
Current unpaid balance - on-balance sheet retail motorcycle finance receivables	6,017,065	6,039,011	6,017,065	6,039,011	$ 5,843,352
Variable Interest Entity, Not Primary Beneficiary | Term asset-backed securitization debt
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Principal balance of finance receivable	301,800		301,800
Retail
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period			139,320	122,025
Provision for credit losses	38,143	28,309	98,230	67,742
Charge-offs	(35,749)	(30,203)	(101,853)	(83,939)
Recoveries	9,369	9,122	32,355	33,303
Other			(3,291)
Balance, end of period	164,761	139,131	164,761	139,131
Wholesale
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period			7,858	5,339
Provision for credit losses	(1,600)	(1,076)	(1,103)	913
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Other			0
Balance, end of period	$ 6,755	$ 6,252	$ 6,755	$ 6,252