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STOCK BASED COMPENSATION (Tables)
 12 Months Ended
Aug. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes the components of the stock-based compensation expense for the twelve-month periods ended August 31, 2012, 2011 and 2010 (in thousands), which are included in general and administrative expense and warehouse club operations in the consolidated statements of income:

 
Years Ended August 31,
 
2012
 
2011
 
2010
Options granted to directors
$
107

 
$
55

 
$
40

Restricted stock awards
4,834

 
3,780

 
3,670

Restricted stock units
528

 
202

 
68

Stock-based compensation expense
$
5,469

 
$
4,037

 
$
3,778
Schedule of Share-based Payment Award, Valuation Assumptions
The following table summarizes various concepts related to stock-based compensation as of and for the twelve-months ended August 31, 2012, 2011 and 2010:

 
August 31,
 
2012
 
2011
 
2010
Remaining unrecognized compensation cost (in thousands)
$
25,543

 
$
8,319

 
$
8,598

Weighted average period of time over which this cost will be recognized (years)
7.8

 
3.2

 
3.0

Excess tax benefit (deficiency) on stock-based compensation (in thousands)
$
1,438

 
$
752

 
$
(57
)
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Restricted stock awards and units activity for the twelve-months ended August 31, 2012, 2011 and 2010 was as follows:

 
Years Ended August 31,
 
2012
 
2011
 
2010
Grants outstanding at beginning of period
436,611

 
558,821

 
618,250

Granted
399,041

 
95,700

 
151,930

Forfeited
(5,230
)
 
(8,231
)
 
(4,971
)
Vested
(129,529
)
 
(209,679
)
 
(206,388
)
Grants outstanding at end of period
700,893

 
436,611

 
558,821
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
The following table summarizes the fair value for restricted stock awards and units for twelve-months of fiscal years 2012, 2011 and 2010:

 
Years Ended August 31,
Weighted Average Grant Date Fair Value
2012
 
2011
 
2010
Restricted stock awards and units granted
$
67.26

 
$
41.25

 
$
23.36

Restricted stock awards and units vested
$
23.46

 
$
16.72

 
$
16.58

Restricted stock awards and units forfeited
$
29.30

 
$
23.58

 
$
18.69