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Basis of Presentation and Consolidation and Recently Issued Accounting Standards (Details)
6 Months Ended
Mar. 31, 2015
Basis of Presentation and Consolidation [Abstract]  
Number of different types of foreign currencies 150intl_NumberOfDifferentTypesOfForeignCurrencies
Number of accounts for customers company-wide 20,000intl_Numberofaccountsforcustomerscompanywide
Number of customers company-wide 11,000intl_NumberOfCustomersCompanyWide