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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Balances at Jul. 31, 2012 $ 561,117 $ 12 $ 326,187 $ (38,043) $ 272,961
Balances (in shares) at Jul. 31, 2012   124,393,700      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 180,025 $ 0 0 0 180,025
Currency translation adjustment (10,487) 0 0 (10,487) 0
Interest rate swap, net of tax effects 1,369 0 0 1,369 0
Exercise of stock options, net of repurchased shares 20,428 $ 1 21,370 0 (943)
Exercise of stock options, net of repurchased shares (in shares)   1,516,534      
Employee stock-based compensation and related tax benefit 21,886 $ 0 21,886 0 0
Shares issued for Employee Stock Purchase Plan 1,948 $ 0 1,948 0 0
Shares issued for Employee Stock Purchase Plan (in shares)   84,761      
Shares repurchased (13,885) $ 0 (2,622) 0 (11,263)
Shares repurchased (in shares)   (500,000)      
Balances at Jul. 31, 2013 762,401 $ 13 368,769 (47,161) 440,780
Balances (in shares) at Jul. 31, 2013   125,494,995      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 178,687 $ 0 0 0 178,687
Currency translation adjustment 26,428 0 0 26,428 0
Interest rate swap, net of tax effects 673 0 0 673 0
Exercise of stock options, net of repurchased shares 9,886 $ 0 10,349 0 (463)
Exercise of stock options, net of repurchased shares (in shares)   566,404      
Employee stock-based compensation and related tax benefit 23,085 $ 0 23,085 0 0
Shares issued for Employee Stock Purchase Plan 2,339 $ 0 2,339 0 0
Shares issued for Employee Stock Purchase Plan (in shares)   81,967      
Balances at Jul. 31, 2014 1,003,499 $ 13 404,542 (20,060) 619,004
Balances (in shares) at Jul. 31, 2014   126,143,366      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 219,783 $ 0 0 0 219,783
Currency translation adjustment (49,518) 0 0 (49,518) 0
Interest rate swap, net of tax effects 785 0 0 785 0
Exercise of stock options, net of repurchased shares 684 $ 0 2,193 0 (1,509)
Exercise of stock options, net of repurchased shares (in shares)   397,520      
Employee stock-based compensation and related tax benefit 19,636 $ 0 19,636 0 0
Shares issued for Employee Stock Purchase Plan 3,079 $ 0 3,079 0 0
Shares issued for Employee Stock Purchase Plan (in shares)   101,015      
Shares repurchased (233,484) $ (1) (21,642) 0 (211,841)
Shares repurchased (in shares)   (6,485,561)      
Balances at Jul. 31, 2015 $ 964,464 $ 12 $ 407,808 $ (68,793) $ 625,437
Balances (in shares) at Jul. 31, 2015   120,156,340