XML 20 R10.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stock Repurchase Program | 12 Months Ended
--- | ---
Sep. 30, 2013
Stock Repurchase Program |
Stock Repurchase Program | 3. Stock Repurchase Program In August 2011, the Company's Board of Directors authorized a stock repurchase program (the Repurchase Program), pursuant to which the Company could purchase its common stock. The dollar value capacity of the Repurchase Program was as follows:
Authorization Date |  | Increase in the Dollar Value Capacity |  | Maximum Dollar Value Capacity at the Authorization Date |
--- | --- | --- | --- | --- | ---
|  | (amounts in millions) |
August 2011 |  | $ | 200.0 |  | $ | 200.0 |
August 2012 |  | $ | 300.0 |  | $ | 500.0 |
January 2013 |  | $ | 500.0 |  | $ | 1,000.0 |
Share repurchases under the Repurchase Program can be made through open market purchases, unsolicited or solicited privately negotiated transactions or other methods, including pursuant to a Rule 10b5-1 plan. Under the Repurchase Program, which includes purchases made through an accelerated share repurchase (ASR) agreement, Rule 10b5-1 repurchase plans and the open market, the Company has purchased a total of 26.6 million shares at an average price of $23.88 per share, for a total cost of $635.3 million. As of September 30, 2013, $364.7 million was available for the repurchase of the Company's common stock pursuant to the Repurchase Program. Repurchased shares are returned to treasury status, but remain authorized for registration and issuance in the future. Accelerated Share Repurchase In connection with the Repurchase Program, the Company entered into an ASR agreement with Bank of America, N.A. (Bank of America) on August 16, 2011. Under the ASR agreement, the Company agreed to repurchase $100 million of its common stock from Bank of America. During the quarter ended September 30, 2011, Bank of America delivered 4.3 million shares to the Company, at which point the Company's shares outstanding were reduced and accounted for as a reduction to retained earnings. The number of shares delivered was the minimum amount of shares Bank of America was contractually obligated to provide under the ASR agreement. The number of shares that ultimately were repurchased by the Company under the ASR agreement was based upon the volume-weighted average share price of the Company's common stock during the term of the ASR agreement, less an agreed discount, subject to collar provisions which established a maximum and minimum price and other customary conditions under the ASR agreement. The ASR agreement was settled in full on March 7, 2012 and the total number of shares repurchased was 4.8 million at an average price of $20.97 per share. Rule 10b5-1 Repurchase Plan and Open Market Purchases In connection with the Repurchase Program, the Company enters into Rule 10b5-1 repurchase plans. The timing, nature and amount of purchases depended on a variety of factors, including market conditions and the volume limit defined by Rule 10b-18. From the inception of the Repurchase Program through September 30, 2013, the Company had repurchased through open market purchases and purchases made under Rule 10b5-1 plans, a total of 21.8 million shares at an average price of $24.52 per share, for a total cost of $535.3 million, which included 0.1 million shares repurchased in transactions that were settled in the first quarter of fiscal 2014.

X
- 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