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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total
Balances at Jul. 31, 2009 $ 17 $ 334,423 $ (27,082) $ 614,101 $ 921,459
Balances (in shares) at Jul. 31, 2009 167,877,628        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       151,627 151,627
Currency translation adjustment     (5,659)   (5,659)
Exercise of stock options, net of repurchased shares   5,351   (7,315) (1,964)
Exercise of stock options, net of repurchased shares (in shares) 954,930        
Employee stock-based compensation and related tax benefit   24,184     24,184
Shares issued for Employee Stock Purchase Plan   2,044     2,044
Shares issued for Employee Stock Purchase Plan (in shares) 136,070        
Shares repurchased   (512)   (3,945) (4,457)
Shares repurchased (in shares) (242,502)        
Balances at Jul. 31, 2010 17 365,490 (32,741) 754,468 1,087,234
Balances (in shares) at Jul. 31, 2010 168,726,126        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       166,375 166,375
Currency translation adjustment     9,516   9,516
Exercise of stock options, net of repurchased shares   6,486   (3,639) 2,847
Exercise of stock options, net of repurchased shares (in shares) 866,526        
Employee stock-based compensation and related tax benefit   22,645     22,645
Shares issued for Employee Stock Purchase Plan   1,957     1,957
Shares issued for Employee Stock Purchase Plan (in shares) 127,192        
Shares repurchased (4) (82,651)   (652,747) (735,402)
Shares repurchased (in shares) (37,708,810)        
Balances at Jul. 31, 2011 13 313,927 (23,225) 264,457 555,172
Balances (in shares) at Jul. 31, 2011 132,011,034       132,011,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       182,119 182,119
Currency translation adjustment     (11,708)   (11,708)
Interest rate swap, net of tax effects     (3,110)   (3,110)
Exercise of stock options, net of repurchased shares   13,202   (2,777) 10,425
Exercise of stock options, net of repurchased shares (in shares) 1,165,605        
Employee stock-based compensation and related tax benefit   26,158     26,158
Shares issued for Employee Stock Purchase Plan   1,957     1,957
Shares issued for Employee Stock Purchase Plan (in shares) 97,769        
Shares repurchased (1) (29,057)   (170,838) (199,897)
Shares repurchased (in shares) (8,880,708)        
Balances at Jul. 31, 2012 $ 12 $ 326,187 $ (38,043) $ 272,961 $ 561,117
Balances (in shares) at Jul. 31, 2012 124,393,700       124,393,700