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Debt, Interest Income, Expense and Other Finance Costs - Additional Information (Details) - Amended Credit Facility $ in Millions	Jan. 30, 2018 USD ($)
Debt Instrument [Line Items]
Payment on outstanding amounts owed	$ 300.0
Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	1,160.0
Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions	200.0
Letters of Credit and Bankers Acceptance
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400.0

X

- Definition

Maximum additional borrowing capacity available under the credit facility at the entity's request subject to satisfaction of certain conditions.

+ References

No definition available.

+ Details

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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

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Period Type:	duration

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- Details

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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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- Details

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