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Retirement Savings Plan | 12 Months Ended
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Dec. 31, 2015
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |
Retirement Savings Plan | Note 5. Retirement Savings Plan The Fastenal Company and Subsidiaries 401(k) and Employee Stock Ownership Plan covers all of our employees in the United States. Our employees in Canada may participate in a Registered Retirement Savings Plan. The general purpose of both of these plans is to provide additional financial security during retirement by providing employees with an incentive to make regular savings. In addition to the contributions of our employees, we make a profit sharing contribution on an annual basis based on an established formula. Our contribution expense under this profit sharing formula was approximately $13,669, $11,460, and $12,211 for 2015, 2014, and 2013, respectively.

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