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Employee Stock Option And Retirement Plans (Restricted Stock And Stock Unit Awards) (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended12 Months Ended3 Months Ended12 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Aug. 31, 2011
Maximum [Member]
February 2010 Employee Restricted Stock Award [Member]
Aug. 31, 2011
November 2010 Employee Restricted Stock Award [Member]
Aug. 31, 2011
January 2011 Employee Restricted Stock Award [Member]
Aug. 31, 2011
April 2011 Employee Restricted Stock Award [Member]
Aug. 31, 2011
October 2009 Employee Restricted Stock Award [Member]
Aug. 31, 2011
February 2010 Employee Restricted Stock Award [Member]
Aug. 31, 2011
Other Employee Restricted Stock Units Granted Award [Member]
Aug. 31, 2011
Other Employee Restricted Stock Units Granted Award [Member]
Employee Stock Option And Retirement Plans [Line Items]           
Restricted stock units granted154,281266,824  117,72336630,090161,79490,030 21,102
Number of restricted stocks granted under cliff vest        55,572  
Vesting rate of restricted stock awards after three years    60.00%60.00%100.00%60.00%100.00%  
Additional number of restricted stocks granted under cliff vest        34,458  
Vesting rate of restricted stock awards after four years        50.00%  
Vesting rate of restricted stock awards after five years    40.00%40.00% 40.00%   
Vesting rate of restricted stock awards after six years        50.00% 25.00%
Unrecognized stock-based compensation expense$ 44,300  $ 2,900$ 6,900$ 100$ 2,600$ 5,300 $ 600$ 600
Unamortized stock-based compensation expense, amortization period (in months)3.2          
Fair value of restricted stock awards granted$ 87.55$ 61.67  $ 84.38$ 95.24$ 99.75$ 62.85$ 59.42 $ 69.88
Stock-based compensation$ 25,773[1]$ 14,065$ 13,623      $ 400 
[1]Included in fiscal 2011 was a pre-tax stock-based compensation charge of $7.9 million ($5.4 million after-tax) from an increase in the estimated number of performance-based options that will vest due to accelerating levels of ASV and diluted EPS than previously expected. The revised estimate reflects a higher performance level than previously estimated and accordingly, increased the number of performance-based options that will vest and be expensed.