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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, 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        
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) (199,896)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       180,025 180,025
Currency translation adjustment     (10,487)   (10,487)
Interest rate swap, net of tax effects     1,369   1,369
Exercise of stock options, net of repurchased shares 1 21,370   (943) 20,428
Exercise of stock options, net of repurchased shares (in shares) 1,516,534        
Employee stock-based compensation and related tax benefit   21,886     21,886
Shares issued for Employee Stock Purchase Plan   1,948     1,948
Shares issued for Employee Stock Purchase Plan (in shares) 84,761        
Shares repurchased   (2,622)   (11,263) (13,885)
Shares repurchased (in shares) (500,000)        
Balances at Jul. 31, 2013 $ 13 $ 368,769 $ (47,161) $ 440,780 $ 762,401
Balances (in shares) at Jul. 31, 2013 125,494,995       125,494,995