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Debt Commitments - Unsecured Revolving Credit Facility (Details) - Credit Facility | 12 Months Ended
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Dec. 31, 2022 USD ($)
Minimum |
Debt Instrument [Line Items] |
Percentage fee paid for unused portion of credit facility | 0.10%
Maximum |
Debt Instrument [Line Items] |
Percentage fee paid for unused portion of credit facility | 0.125%
Daily Simple SOFR |
Debt Instrument [Line Items] |
Per annum interest rate over Daily Simple SOFR, spread adjustment | 0.10%
Per annum interest rate over Daily Simple SOFR | 0.95%
Unsecured Revolving Credit Facility |
Debt Instrument [Line Items] |
Credit facility, maximum borrowing capacity | $ 835,000,000.0
Credit facility, uncommitted accordion option, increase limit | 365,000,000.0
Credit facility, uncommitted accordion option, higher borrowing capacity option | 1,200,000,000
Letter of Credit Subfacility |
Debt Instrument [Line Items] |
Credit facility, maximum borrowing capacity | $ 55,000,000.0

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- Definition Debt Instrument, Basis Spread On Variable Rate, Spread Adjustment + References No definition available. + Details
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Namespace Prefix: | fast_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Uncommitted Accordion Option, Higher Borrowing Capacity Option + References No definition available. + Details
Name: | fast_LineOfCreditFacilityUncommittedAccordionOptionHigherBorrowingCapacityOption
Namespace Prefix: | fast_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Uncommitted Accordion Option, Increase Limit + References No definition available. + Details
Name: | fast_LineOfCreditFacilityUncommittedAccordionOptionIncreaseLimit
Namespace Prefix: | fast_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=fast_DailySimpleSecuredOvernightFinancingRateSOFRMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |