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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Noncontrolling Interests
Beginning Balance at Aug. 31, 2014 $ 2,260,368 $ 244 $ 1,874,219 $ 1,245,772 $ 86,962 $ (965,369) $ 18,540
Beginning Balance (in shares) at Aug. 31, 2014   194,113,850          
Shares issued upon exercise of stock options (in shares)   36,165          
Shares issued under employee stock purchase plan 18,060 $ 2 18,058        
Shares issued under employee stock purchase plan (in shares)   1,005,916          
Vesting of restricted stock awards   $ 1 (1)        
Vesting of restricted stock awards (in shares)   1,706,944          
Purchases of treasury stock under employee stock plans (7,606)         (7,606)  
Purchases of treasury stock under employee stock plans (in shares)   (402,143)          
Treasury shares purchased (85,576)         $ (85,576)  
Treasury shares purchased (in shares)           (4,392,664)  
Recognition of stock-based compensation 62,826   62,826        
Excess tax benefit of stock awards 2   2        
Declared dividends (60,881)     (60,881)      
Comprehensive income 147,796     284,019 (137,816)   1,593
Acquisition/Adjustment of noncontrolling interests 329           329
Purchase of noncontrolling interests (345)           (345)
Foreign currency adjustments attributable to noncontrolling interests 38           38
Ending Balance at Aug. 31, 2015 2,335,011 $ 247 1,955,104 1,468,910 (50,854) $ (1,058,551) 20,155
Ending Balance (in shares) at Aug. 31, 2015   192,068,068          
Shares issued upon exercise of stock options (in shares)   19,109          
Shares issued under employee stock purchase plan 20,911 $ 1 20,910        
Shares issued under employee stock purchase plan (in shares)   1,246,947          
Vesting of restricted stock awards   $ 2 (2)        
Vesting of restricted stock awards (in shares)   1,817,635          
Purchases of treasury stock under employee stock plans (10,656)         (10,656)  
Purchases of treasury stock under employee stock plans (in shares)   (462,900)          
Treasury shares purchased (148,340)         $ (148,340)  
Treasury shares purchased (in shares)           (7,690,387)  
Recognition of stock-based compensation 58,997   58,997        
Declared dividends (62,185)     (62,185)      
Comprehensive income 265,873     254,095 10,977   801
Declared dividends to noncontrolling interests (1,500)           (1,500)
Purchase of noncontrolling interests (600)   (484)       (116)
Foreign currency adjustments attributable to noncontrolling interests (14)           (14)
Ending Balance at Aug. 31, 2016 2,457,497 $ 250 2,034,525 1,660,820 (39,877) $ (1,217,547) 19,326
Ending Balance (in shares) at Aug. 31, 2016   186,998,472          
Shares issued upon exercise of stock options (in shares)   172,620          
Shares issued under employee stock purchase plan 21,792 $ 1 21,791        
Shares issued under employee stock purchase plan (in shares)   1,228,316          
Vesting of restricted stock awards   $ 2 (2)        
Vesting of restricted stock awards (in shares)   2,102,049          
Purchases of treasury stock under employee stock plans (12,268)         (12,268)  
Purchases of treasury stock under employee stock plans (in shares)   (550,096)          
Treasury shares purchased (306,640)         $ (306,640)  
Treasury shares purchased (in shares)           (12,223,708)  
Recognition of stock-based compensation 47,889   47,889        
Declared dividends (59,017)     (59,017)      
Comprehensive income 221,664     129,090 94,497   (1,923)
Declared dividends to noncontrolling interests (2,293)           (2,293)
Purchase of noncontrolling interests (134)           (134)
Foreign currency adjustments attributable to noncontrolling interests (146)           (146)
Ending Balance at Aug. 31, 2017 $ 2,368,344 $ 253 $ 2,104,203 $ 1,730,893 $ 54,620 $ (1,536,455) $ 14,830
Ending Balance (in shares) at Aug. 31, 2017   177,727,653