XML 43 R31.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Other Financial Information (Tables) | 3 Months Ended
--- | ---
Dec. 31, 2016
Other Financial Information |
Schedule of accrued expenses and other current liabilities |
|  | December 31, 2016 |  | September 30, 2016 |
|  | (in millions) |
Accrued salaries and benefits |  | $ | 887.5 |  | $ | 964.9 |
Accrued contract costs |  | 991.6 |  | 1,009.8 |
Other accrued expenses |  | 289.4 |  | 410.1 |
|  | $ | 2,168.5 |  | $ | 2,384.8 |

X
- References No definition available. + Details
Name: | acm_OtherFinancialInformationDisclosureAbstract
Namespace Prefix: | acm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration