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Commitments and Contingencies - Defined Benefit Pension Plan (Details) - Mar. 07, 2014 £ in Millions, $ in Millions | GBP (£) | USD ($)
--- | --- | ---
Watson Plan |  |
Defined benefit pension plan |  |
Assumed pension exit obligation | £ 9.6 | $ 16.0

X
- Definition Represents the estimated assumed pension exit obligation in connection with an acquisition. + References No definition available. + Details
Name: | int_BusinessCombinationDefinedBenefitPlanAssumedPensionExitObligation
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=int_WatsonDefinedBenefitPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |