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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 02, 2018
Segment Reporting Information [Line Items] |  |  |  |
Advertising expenses | $ 3.1 | $ 2.9 | $ 3.0 |
Shipping costs | 4.8 | 5.7 | 6.4 |
Research and development | $ 9.8 | $ 8.7 | $ 8.5 |
Effective income tax rate | 32.80% | 35.60% | 35.40% |
Subsequent Event [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Contract liability |  |  |  | $ 7.0
Accounting Standards Update 2016-09 [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impact on effective income tax rate | 2.00% |  |  |
Scenario Previously Reported [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impact on current deferred income tax assets |  | $ 8.8 |  |
Impact on noncurrent deferred income tax liabilities |  | $ 8.5 |  |
Tools, Dies and Molds [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Useful life | 3 years |  |  |
Building [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Useful life | 15 years |  |  |
Machinery and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Useful life | 7 years |  |  |
Unaffiliated Castings [Member] | Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of sales | 1.00% |  |  |
Firearms [Member] | Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of sales | 99.00% |  |  |
Firearms [Member] | Sales [Member] | Non-US [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of sales | 4.00% |  |  |

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