Name:	fds_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets1
Namespace Prefix:	fds_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of acquisition cost of a business combination allocated to assets acquired.

No definition available.

Name:	fds_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired1
Namespace Prefix:	fds_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

No definition available.

Name:	fds_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet1
Namespace Prefix:	fds_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

No definition available.

Name:	fds_BusinessAcquisitionPurchasePriceAllocationGoodwill
Namespace Prefix:	fds_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of acquisition cost of a business combination allocated to liabilities assumed.

No definition available.

Name:	fds_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed1
Namespace Prefix:	fds_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of acquisition cost of a business combination allocated to tangible assets.

No definition available.