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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

X

- Details

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