Name:	int_FairMarketValueOfNumberOfSharesOfCommonStockUsedInCalculationOfStockUnitsPaidAsDividends
Namespace Prefix:	int_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the aggregate carrying value of the outstanding stock units under the Stock Deferral Plan.

No definition available.

Name:	int_ShareBasedCompensationArrangementByShareBasedPaymentAwardCarryingValue
Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the number of shares equivalent to each stock unit under the share-based plan.

No definition available.

Name:	int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEachStockUnitEquivalentToNumberOfSharesOfCommonStock
Namespace Prefix:	int_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the stock units outstanding as of the balance sheet date.

No definition available.

Name:	int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumber
Namespace Prefix:	int_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The period of time from the grant date until the time at which the share-based award expires.

No definition available.

Name:	int_ShareBasedCompensationArrangementsByShareBasedPaymentAwardExpirationTerm
Namespace Prefix:	int_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901