Income Taxes	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	(4) Income Taxes Fastenal files income tax returns in the United States federal jurisdiction, all states, and various local and foreign jurisdictions. With limited exceptions, we are no longer subject to income tax examinations by taxing authorities for taxable years before 2014 in the case of United States federal and foreign examinations and 2012 in the case of state and local examinations. As of March 31, 2017 and 2016, liabilities recorded related to gross unrecognized tax benefits were $5.5 and $5.8, respectively. Included in these liabilities for gross unrecognized tax benefits is an immaterial amount for interest and penalties, both of which we classify as a component of income tax expense. We do not anticipate significant changes in total unrecognized tax benefits during the next twelve months.

Income Taxes

3 Months Ended

Mar. 31, 2017

(4) Income Taxes

Fastenal files income tax returns in the United States federal jurisdiction, all states, and various local and foreign jurisdictions. With limited exceptions, we are no longer subject to income tax examinations by taxing authorities for taxable years before 2014 in the case of United States federal and foreign examinations and 2012 in the case of state and local examinations.

As of March 31, 2017 and 2016, liabilities recorded related to gross unrecognized tax benefits were $5.5 and $5.8, respectively. Included in these liabilities for gross unrecognized tax benefits is an immaterial amount for interest and penalties, both of which we classify as a component of income tax expense. We do not anticipate significant changes in total unrecognized tax benefits during the next twelve months.