XML 97 R10.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Stock Repurchase Program | 12 Months Ended
--- | ---
Sep. 30, 2014
Stock Repurchase Program |
Stock Repurchase Program | 3. Stock Repurchase Program The Company’s Board of Directors has authorized the repurchase of up to $1.0 billion in Company stock. Share repurchases can be made through open market purchases or other methods, including pursuant to a Rule 10b5-1 plan. From the inception of the stock repurchase program, the Company has purchased a total of 27.4 million shares at an average price of $24.10 per share, for a total cost of $660.1 million as of September 30, 2014.

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

X
- Definition The entire disclosure of the total number of common shares repurchased by the entity. + References No definition available. + Details
Name: | acm_StockRepurchaseProgramDisclosureTextBlock
Namespace Prefix: | acm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration