XML 60 R40.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Intangible Assets (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2018
Intangible Assets [Abstract] |
Schedule of Finite and Indefinite-Lived Intangible Assets [Table Text Block] | The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions):
| September 30, 2018 |  | September 30, 2017
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |
Trade name | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Software programs/platforms | 2.7 |  |  | (2.6 | ) |  | 0.1 |  |  | 2.7 |  |  | (2.5 | ) |  | 0.2 |
Client base | 21.4 |  |  | (10.1 | ) |  | 11.3 |  |  | 20.0 |  |  | (7.9 | ) |  | 12.1 |
Total intangible assets | $ | 24.1 |  |  | $ | (12.7 | ) |  | $ | 11.4 |  |  | $ | 22.7 |  |  | $ | (10.4 | ) |  | $ | 12.3 |
Schedule of Expected Amortization Expense [Table Text Block] | Amortization expense related to intangible assets was $2.3 million, $2.8 million, and $1.6 million for the fiscal years ended September 30, 2018, 2017, and 2016, respectively. The estimated future amortization expense as of September 30, 2018 is as follows (in millions):
Year ending September 30, |
2019 | $ | 2.5 |
2020 | 2.2 |
2021 | 2.2 |
2022 | 1.0 |
2023 and thereafter | 3.5 |
| $ | 11.4 |

X
- Definition Intangible Assets [Abstract] + References No definition available. + Details
Name: | intl_IntangibleAssetsAbstract
Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life or exist in perpetuity, by either major class or business segment. + References No definition available. + Details
Name: | intl_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTableTextBlock
Namespace Prefix: | intl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration