Quarterly report pursuant to Section 13 or 15(d)

Contingencies And Litigation (Details)

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Contingencies And Litigation (Details) (USD $)
In Millions, unless otherwise specified
Nov. 30, 2011
Aug. 31, 2011
Contingencies And Litigation [Abstract]    
Outstanding letters of credit $ 8.7 $ 9.5
Discounted present value of future minimum lease payments $ 4.0