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Fair Value (Tables)
 3 Months Ended
Nov. 30, 2011
Fair Value [Abstract]  
Financial assets and financial liabilities measured at fair value on recurring basis
                                 
          Fair Value Measurements at Reporting Date Using  

(in thousands)

   November 30,
2011		     Quoted Prices in
Active  Markets for
Identical Assets
(Level 1)		     Significant Other
Observable  Inputs
(Level 2)		     Significant
Unobservable  Inputs
(Level 3)		  

Money market investments

   $ 128,391     $ 128,391     $ —       $ —    

Derivative assets

     49,465       1,918       47,547       —    

Nonqualified benefit plan assets *

     48,680       48,680       —         —    

Derivative liabilities

     7,736       3,199       4,537       —    

Nonqualified benefit plan liabilities *

     79,239       —         79,239       —    
     
           Fair Value Measurements at Reporting Date Using  

(in thousands)

   August 31,
2011		     Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		     Significant Other
Observable Inputs
(Level 2)		     Significant
Unobservable Inputs
(Level 3)		  

Money market investments

   $ 153,839     $ 153,839     $ —       $ —    

Derivative assets

     52,858       2,329       50,529       —    

Nonqualified benefit plan assets *

     49,357       49,357       —         —    

Derivative liabilities

     5,688       2,625       3,063       —    

Nonqualified benefit plan liabilities *

     81,167       —         81,167       —    

 

* The Company provides a nonqualified benefit restoration plan to certain eligible executives equal to amounts that would have been available under tax qualified ERISA plans but for limitations of ERISA, tax laws and regulations. Though under no obligation to fund this plan, the Company has segregated assets in a trust. The plan assets and liabilities consist of securities included in various mutual funds.