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STOCK BASED COMPENSATION Stock compensation expense (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2014    
Common Stock, Shares Authorized 45,000,000 45,000,000  
Options granted to directors $ 91 $ 113 $ 107
Restricted stock awards 5,326 5,268 4,834
Restricted stock units 1,034 921 528
Stock-based compensation expense 6,451 6,302 5,469
Remaining unrecognized compensation cost (in thousands) 21,196 25,450 25,543
Weighted average period of time over which this cost will be recognized (years) 6 years 7 years 8 years
Excess tax benefit (deficiency) on stock-based compensation (in thousands) 1,489 1,336 1,438
Restricted stock awards and units granted $ 105.76 $ 80.79 $ 67.26
Restricted stock awards and units vested $ 39.91 $ 39.33 $ 23.46
Restricted stock awards and units forfeited $ 54.21 $ 30.88 $ 29.30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 13,797 10,673 8,812
Treasury Stock, Shares, Acquired 50,898 44,460 46,373
Treasury Stock, Value, Acquired, Cost Method $ 4,773 $ 3,467 $ 3,154
Stock Issued During Period, Shares, Treasury Stock Reissued 0 0 196,850
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 23,000 28,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Grants outstanding at beginning of period 623,424 700,893 436,611
Granted 14,828 62,046 399,041
Forfeited (2,669) (3,021) (5,230)
Vested (147,167) (136,494) (129,529)
Grants outstanding at end of period 488,416 623,424 700,893
2013 Equity Incentive Award Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 838,766 600,000  
Common Stock, Shares Authorized   1,531,818  
Common Stock, Capital Shares Reserved for Future Issuance 821,124 782,385