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Stockholders' Equity (Stock Options Granted) (Details) (USD $) | 92 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted | 9,055,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
Options Outstanding | 4,712,330 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 4,712,330 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Exercisable | 1,972,330 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | 1,972,330 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
April 22, 2014 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 955,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember
Option Exercise (Strike) Price |  | $ 56.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember
Closing Stock Price on Date of Grant | 50.53 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember | $ 50.53 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember
Options Outstanding | 852,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember | 852,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember
Options Exercisable | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilTwentySecondTwoThousandFourteenMember
April 16, 2013 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 205,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember
Option Exercise (Strike) Price |  | $ 54.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember
Closing Stock Price on Date of Grant | 49.25 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember | $ 49.25 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember
Options Outstanding | 155,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember | 155,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember
Options Exercisable | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilSixteenthTwoThousandThirteenMember
April 17, 2012 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 1,235,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember
Option Exercise (Strike) Price |  | $ 54.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember
Closing Stock Price on Date of Grant | 49.01 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember | $ 49.01 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember
Options Outstanding | 1,077,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember | 1,077,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember
Options Exercisable | 243,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember | 243,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandTwelveMember
April 19, 2011 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 410,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember
Option Exercise (Strike) Price |  | $ 35.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember
Closing Stock Price on Date of Grant | 31.78 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember | $ 31.78 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember
Options Outstanding | 320,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember | 320,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember
Options Exercisable | 60,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember | 60,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilNineteenthTwoThousandElevenMember
April 20, 2010 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 530,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember
Option Exercise (Strike) Price |  | $ 30.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember
Closing Stock Price on Date of Grant | 27.13 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember | $ 27.13 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember
Options Outstanding | 237,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember | 237,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember
Options Exercisable | 102,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember | 102,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilTwentiethTwoThousandTenMember
April 21, 2009 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 790,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember
Option Exercise (Strike) Price |  | $ 27.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember
Closing Stock Price on Date of Grant | 17.61 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember | $ 17.61 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember
Options Outstanding | 345,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember | 345,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember
Options Exercisable | 199,350 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember | 199,350 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilTwentyFirstTwoThousandNineMember
April 15, 2008 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 550,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember
Option Exercise (Strike) Price |  | $ 27.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember
Closing Stock Price on Date of Grant | 24.35 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember | $ 24.35 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember
Options Outstanding | 172,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember | 172,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember
Options Exercisable | 117,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember | 117,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilFifteenthTwoThousandEightMember
April 17, 2007 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted |  | 4,380,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember
Option Exercise (Strike) Price |  | $ 22.50 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember
Closing Stock Price on Date of Grant | 20.15 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember | $ 20.15 us-gaap_SharePrice / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember
Options Outstanding | 1,551,930 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember | 1,551,930 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember
Options Exercisable | 1,249,430 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember | 1,249,430 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardDateAxis = fast_AprilSeventeenthTwoThousandSevenMember

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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