|
Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Aug. 31, 2012
|
Aug. 31, 2011
|
May 31, 2012
|
|
| Description of business and significant accounting policies (Textual) [Abstract] | |||
| Maximum individual workers' compensation claims liability | $ 1.0 | $ 1.0 | |
| Workers' compensation insurance costs in current liabilities | 6.7 | 6.2 | |
| Workers compensation insurance costs in long-term liabilities | 14.6 | 19.0 | |
| Stock-based compensation costs recognized | $ 6.4 | $ 6.6 | |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Maximum individual claims liability workers compensation insurance. No definition available.
|
| X | ||||||||||
|
- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the noncurrent portion of the liabilities (due beyond one year; or beyond one operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|