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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
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders’ Equity $ 1,003,499          
Balances attributable to Parent at Jul. 31, 2014   $ 26 $ 404,529 $ (20,060) $ 619,004  
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2014           $ 0
Balances (in shares) at Jul. 31, 2014   252,286,732        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 219,783 $ 0 0 0 219,783  
Net Income (Loss), Attributable to Noncontrolling Interest 0         0
Net income 219,783          
Currency translation adjustment (49,518) 0 0 (49,518) 0 0
Interest rate swap, net of tax effects 785 0 0 785 0 0
Exercise of stock options, net of repurchased shares 684 $ 0 2,193 0 (1,509) 0
Exercise of stock options, net of repurchased shares (in shares)   795,040        
Employee stock-based compensation and related tax benefit 19,636 $ 0 19,636 0 0 0
Shares issued for Employee Stock Purchase Plan 3,079 $ 0 3,079 0 0 0
Shares issued for Employee Stock Purchase Plan (in shares)   202,030        
Shares repurchased (233,484) $ (2) (21,641) 0 (211,841) 0
Shares repurchased (in shares)   (12,971,122)        
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2015           0
Balances attributable to Parent at Jul. 31, 2015   $ 24 407,796 (68,793) 625,437  
Balances (in shares) at Jul. 31, 2015   240,312,680        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders’ Equity 964,464          
Net income 270,360 $ 0 0 0 270,360  
Net Income (Loss), Attributable to Noncontrolling Interest 0         0
Net income 270,360          
Currency translation adjustment (40,684) 0 0 (40,684) 0 0
Interest rate swap, net of tax effects 283 0 0 283 0 0
Exercise of stock options, net of repurchased shares (1,114) $ 0 (372) 0 (742) 0
Exercise of stock options, net of repurchased shares (in shares)   2,258,880        
Employee stock-based compensation and related tax benefit 20,631 $ 0 20,631 0 0 0
Shares issued for Employee Stock Purchase Plan 3,369 $ 0 3,369 0 0 0
Shares issued for Employee Stock Purchase Plan (in shares)   216,264        
Shares repurchased (442,853) $ (2) (38,990) 0 (403,861) 0
Shares repurchased (in shares)   (22,543,704)        
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2016 0         0
Balances attributable to Parent at Jul. 31, 2016   $ 22 392,434 (109,194) 491,194  
Balances (in shares) at Jul. 31, 2016   220,244,120        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders’ Equity 774,456          
Net income 394,227 $ 0 0 0 394,227  
Net Income (Loss), Attributable to Noncontrolling Interest 34         34
Net income 394,261          
Currency translation adjustment 8,518 0 0 8,518 0 0
Noncontrolling Interest, Increase from Business Combination   0 0 0 0 500
Exercise of stock options, net of repurchased shares (104,245) $ 1 35,805 0 (140,051) 0
Exercise of stock options, net of repurchased shares (in shares)   10,053,463        
Employee stock-based compensation and related tax benefit 20,840 $ 0 20,840 0 0 0
Shares issued for Employee Stock Purchase Plan 4,270 $ 0 4,270 0 0 0
Shares issued for Employee Stock Purchase Plan (in shares)   190,713        
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2017 534         $ 534
Balances attributable to Parent at Jul. 31, 2017   $ 23 $ 453,349 $ (100,676) $ 745,370  
Balances (in shares) at Jul. 31, 2017   230,488,296        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders’ Equity $ 1,098,600