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Additional Balance Sheet and Cash Flow Information (Inventories, Net) (Detail) - USD ($) $ in Thousands | Sep. 24, 2017 | Dec. 31, 2016 | Sep. 25, 2016
--- | --- | --- | ---
Inventory [Line Items] |  |  |
Raw materials and work in process | $ 155,947 | $ 140,639 | $ 159,209
Inventory at lower of FIFO cost or net realizable value | 517,358 | 548,184 | 475,815
Excess of FIFO over LIFO cost | (48,267) | (48,267) | (49,268)
Inventories, net | 469,091 | 499,917 | 426,547
Motorcycles |  |  |
Inventory [Line Items] |  |  |
Finished goods | 232,141 | 285,281 | 182,019
Parts and Accessories and General Merchandise |  |  |
Inventory [Line Items] |  |  |
Finished goods | $ 129,270 | $ 122,264 | $ 134,587

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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