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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 | $ 774,456 |  |  |  |  |
Balances attributable to Parent at Jul. 31, 2016 |  | $ 22 | $ 392,434 | $ (109,194) | $ 491,194 |
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2016 |  |  |  |  |  | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
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 | 500 | 0 | 0 | 0 | 0 | 500
Exercise of stock options, net of repurchased shares | (104,245) | 1 | 35,805 | 0 | (140,051) | 0
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
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2017 |  |  |  |  |  | 534
Balances attributable to Parent at Jul. 31, 2017 |  | $ 23 | 453,349 | (100,676) | 745,370 |
Balances (in shares) at Jul. 31, 2016 |  | 220,244,120 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, net of repurchased shares (in shares) |  | 10,053,463 |  |  |  |
Shares issued for Employee Stock Purchase Plan (in shares) |  | 190,713 |  |  |  |
Balances (in shares) at Jul. 31, 2017 |  | 230,488,296 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stockholders’ Equity | 1,098,600 |  |  |  |  |
Net income | 417,867 | $ 0 | 0 | 0 | 417,867 |
Net Income (Loss), Attributable to Noncontrolling Interest | 140 |  |  |  |  | 140
Net income | 418,007 |  |  |  |  |
Currency translation adjustment | (7,252) | 0 | 0 | (7,252) | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (235) | 0 | 0 | 0 | 0 | (235)
Noncontrolling Interest, Decrease from Deconsolidation | (439) | 0 | 0 | 0 | 0 | (439)
Exercise of stock options, net of repurchased shares | 43,344 | 0 | 44,459 | 0 | (1,115) | 0
Employee stock-based compensation and related tax benefit | 23,221 | 0 | 23,197 | 0 | 24 | 0
Shares issued for Employee Stock Purchase Plan | 5,853 | 0 | 5,853 | 0 | 0 | 0
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2018 |  |  |  |  |  | 0
Balances attributable to Parent at Jul. 31, 2018 |  | $ 23 | 526,858 | (107,928) | 1,162,146 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, net of repurchased shares (in shares) |  | 3,225,377 |  |  |  |
Shares issued for Employee Stock Purchase Plan (in shares) |  | 185,168 |  |  |  |
Balances (in shares) at Jul. 31, 2018 |  | 233,898,841 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stockholders’ Equity | 1,581,099 |  |  |  |  |
Net income | 591,693 | $ 0 | 0 | 0 | 591,693 |
Net Income (Loss), Attributable to Noncontrolling Interest | 0 |  |  |  |  | 0
Net income | 591,693 |  |  |  |  |
Currency translation adjustment | (24,601) | 0 | 0 | (24,601) | 0 | 0
Exercise of stock options, net of repurchased shares | (12,487) | 0 | 32,500 | 0 | (44,987) | 0
Employee stock-based compensation and related tax benefit | 23,445 | 0 | 23,445 | 0 | 0 | 0
Shares issued for Employee Stock Purchase Plan | 7,183 | 0 | 7,183 | 0 | 0 | 0
Shares repurchased | (364,997) | 0 | (17,427) | 0 | (347,570) | 0
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2019 |  |  |  |  |  | $ 0
Balances attributable to Parent at Jul. 31, 2019 |  | $ 23 | $ 572,559 | $ (132,529) | $ 1,338,328 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, net of repurchased shares (in shares) |  | 3,349,980 |  |  |  |
Shares issued for Employee Stock Purchase Plan (in shares) |  | 177,043 |  |  |  |
Shares repurchased (in shares) |  | (7,635,596) |  |  |  |
Balances (in shares) at Jul. 31, 2019 |  | 229,790,268 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stockholders’ Equity | $ 1,778,381 |  |  |  |  |

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