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Commitments and Contingencies - Self-Insurance (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
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Commitments and Contingencies [Abstract] |  |
Self Insurance Reserve | $ 1.0 | $ 0.8

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- Definition Commitments and Contingencies [Abstract] + References No definition available. + Details
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Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant