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Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Contract With Customer, Liability [Roll Forward]
Outstanding at beginning of period	$ 31.3	$ 24.9
Increase (decrease) attributed to:
Sales incentive accruals	11.9	9.1
Contract payments	(9.6)	(7.1)
Outstanding at end of period	$ 33.6	$ 26.9

X

- Definition

Contract With Customer, Liability, Contract Payments

+ References

No definition available.

+ Details

Name:	fast_ContractWithCustomerLiabilityContractPayments
Namespace Prefix:	fast_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Increase (Decrease) For Sales Incentive Accruals

+ References

No definition available.

+ Details

Name:	fast_ContractWithCustomerLiabilityIncreaseDecreaseForSalesIncentiveAccruals
Namespace Prefix:	fast_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability [Roll Forward]

+ References

No definition available.

+ Details

Name:	fast_ContractWithCustomerLiabilityRollForward
Namespace Prefix:	fast_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130609-203046-203046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130607-203046-203046

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL51751984-203043

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant