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Retirement Savings Plan	12 Months Ended
Retirement Savings Plan	Dec. 31, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Retirement Savings Plan	Note 6. 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 under this profit sharing formula was approximately $11,110, $7,717 and $5,005 for 2012, 2011, and 2010, respectively.

The entire disclosure for pension and other postretirement benefits.

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