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Financial Instruments And Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Financial Instruments And Marketable Securities [Line Items] |  |
Dollar value of transfers between levels | $ 0 | $ 0
Government And Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial Instruments And Marketable Securities [Line Items] |  |
Debt instrument maturity date in months | 12 |

X
- Definition Debt instrument maturity date in months + References No definition available. + Details
Name: | fast_DebtInstrumentMaturityDateInMonths
Namespace Prefix: | fast_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | fast_FinancialInstrumentsAndMarketableSecuritiesLineItems
Namespace Prefix: | fast_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The dollar amount of transfers between the three levels of fair value hierarchy. + References No definition available. + Details
Name: | fast_MarketableSecurityLevelTransfers
Namespace Prefix: | fast_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration