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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2012
Significant Other Observable Market Inputs (Level 2)
Discounted cash flow analysis
Note receivable
Aug. 31, 2012
Significant Other Observable Market Inputs (Level 2)
Discounted cash flow analysis
Long-term debt - fixed rate
Aug. 31, 2012
Significant Other Observable Market Inputs (Level 2)
Discounted cash flow analysis
Long-term debt - fixed rate
One Senior Note
Feb. 29, 2012
Significant Other Observable Market Inputs (Level 2)
Discounted cash flow analysis
Long-term debt - fixed rate
Multiple Senior Notes
Minimum
Feb. 29, 2012
Significant Other Observable Market Inputs (Level 2)
Discounted cash flow analysis
Long-term debt - fixed rate
Multiple Senior Notes
Maximum
Aug. 31, 2012
Recurring
Fair Values
Feb. 29, 2012
Recurring
Fair Values
Aug. 31, 2012
Recurring
Fair Values
Interest rate swaps
Feb. 29, 2012
Recurring
Fair Values
Interest rate swaps
Aug. 31, 2012
Recurring
Fair Values
Foreign currency contracts and currency swaps
Feb. 29, 2012
Recurring
Fair Values
Foreign currency contracts and currency swaps
Aug. 31, 2012
Recurring
Fair Values
Long-term debt - fixed rate
Feb. 29, 2012
Recurring
Fair Values
Long-term debt - fixed rate
Aug. 31, 2012
Recurring
Fair Values
Long-term debt - floating rate
Feb. 29, 2012
Recurring
Fair Values
Long-term debt - floating rate
Aug. 31, 2012
Recurring
Fair Values
Money market accounts
Feb. 29, 2012
Recurring
Fair Values
Money market accounts
Aug. 31, 2012
Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1)
Feb. 29, 2012
Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1)
Aug. 31, 2012
Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1)
Money market accounts
Feb. 29, 2012
Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1)
Money market accounts
Aug. 31, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Feb. 29, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Aug. 31, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Interest rate swaps
Feb. 29, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Interest rate swaps
Aug. 31, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Foreign currency contracts and currency swaps
Feb. 29, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Foreign currency contracts and currency swaps
Aug. 31, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Long-term debt - fixed rate
Feb. 29, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Long-term debt - fixed rate
Aug. 31, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Long-term debt - floating rate
Feb. 29, 2012
Recurring
Significant Other Observable Market Inputs (Level 2)
Long-term debt - floating rate
Assets:                                                              
Cash and cash equivalents                   $ 36           $ 1,119 $ 801     $ 1,119 $ 801         $ 36          
Note receivable             737                               737                
Total assets           1,155 1,538                     1,119 801     36 737                
Liabilities:                                                              
Long-term debt   104,560                   104,559 104,450 75,000 75,000                         104,559 104,450 75,000 75,000
Derivative liabilities               7,148 8,553 322 163                         7,148 8,553 322 163        
Total liabilities           $ 187,029 $ 188,166                             $ 187,029 $ 188,166                
Fair value additional disclosures                                                              
Discount rate (as a percent) 6.95%   2.48% 0.54% 3.54%