|
Consolidated Balance Sheets (Parentheticals) (USD $)
|
Nov. 30, 2012
|
Aug. 31, 2012
|
|---|---|---|
| Cash and cash equivalents related to variable interest entities (VIEs) (in Dollars) | $ 74,569,000 | $ 92,176,000 |
| Short-term investments related to VIEs (in Dollars) | 3,000,000 | 3,000,000 |
| Accounts receivable, including retainage, net related to VIEs (in Dollars) | 45,894,000 | 22,664,000 |
| Accumulated depreciation (in Dollars) | $ 390,300,000 | $ 376,300,000 |
| Preferred stock, shares authorized | 20,000,000 | 20,000,000 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Preferred stock, par value (in Dollars per share) | $ 0 | $ 0 |
| Common stock, shares authorized | 200,000,000 | 200,000,000 |
| Common stock, shares issued | 93,227,119 | 93,016,409 |
| Common stock, shares outstanding | 66,635,878 | 66,425,168 |
| Common stock, par value (in Dollars per share) | $ 0 | $ 0 |
| Treasury stock shares | 26,591,241 | 26,591,241 |