Business Segments (Information By Strategic Business Units) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017
Segment Reporting Information
Motorcycles net revenue	$ 1,123,945	$ 962,136	$ 4,013,013	$ 3,867,982
Selling, administrative and engineering expense	306,665	293,538	909,898	856,606
Restructuring expense	14,832	0	74,044	0
Financial Services revenue	191,724	189,059	558,000	550,314
Operating income	149,416	94,412	709,780	782,881
Motorcycles and Related Products
Segment Reporting Information
Motorcycles net revenue	1,123,945		4,013,013
Restructuring expense	14,832		74,044
Financial Services
Segment Reporting Information
Financial Services revenue	191,724		558,000
Operating Segments \| Motorcycles and Related Products
Segment Reporting Information
Motorcycles net revenue	1,123,945	962,136	4,013,013	3,867,982
Gross profit	347,415	274,313	1,353,273	1,322,098
Selling, administrative and engineering expense	266,921	256,961	797,323	750,848
Restructuring expense	14,832	0	74,044	0
Operating income	65,662	17,352	481,906	571,250
Operating Segments \| Financial Services
Segment Reporting Information
Financial Services revenue	191,724	189,059	558,000	550,314
Financial Services expense	107,970	111,999	330,126	338,683
Operating income	$ 83,754	$ 77,060	$ 227,874	$ 211,631

The aggregate costs incurred during the reporting period related to financial services rendered by an entity.

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The aggregate financial services revenue and operating interest income earned during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 5.P.3)
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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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