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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Common Stock Including Additional Paid in Capital | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders’ Equity | $ 1,098,600 |  |  |  |  |  |
Balances attributable to Parent at Jul. 31, 2017 |  | $ 23 |  | $ 453,349 | $ (100,676) | $ 745,370 |
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2017 |  |  |  |  |  |  | $ 534
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 417,867 |  |  |  |  | 417,867 |
Net Income (Loss), Attributable to Noncontrolling Interest | 140 |  |  |  |  |  | 140
Net income | 418,007 |  |  |  |  |  |
Currency translation adjustment | (7,252) |  |  |  | (7,252) |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (235) |  |  |  |  |  | (235)
Exercise of stock options, net of repurchased shares | 43,344 |  |  | 44,459 |  | (1,115) |
Employee stock-based compensation and related tax benefit | 23,221 |  |  | 23,197 |  | 24 |
Shares issued for Employee Stock Purchase Plan | 5,853 |  |  | 5,853 |  |  |
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 |
Balances (in shares) at Jul. 31, 2017 |  | 230,488,296 |  |  |  |  |
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 | 591,693 |
Net Income (Loss), Attributable to Noncontrolling Interest | 0 |  |  |  |  |  |
Net income | 591,693 |  |  |  |  |  |
Currency translation adjustment | (24,601) |  |  |  | (24,601) |  |
Noncontrolling Interest, Decrease from Deconsolidation | (439) |  |  |  |  |  | (439)
Exercise of stock options, net of repurchased shares | (12,487) |  |  | 32,500 |  | (44,987) |
Employee stock-based compensation and related tax benefit | 23,445 |  |  | 23,445 |  |  |
Shares issued for Employee Stock Purchase Plan | 7,183 |  |  | 7,183 |  |  |
Shares repurchased | (364,997) |  |  | (17,427) |  | (347,570) |
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 |  |  |  |  |  |
Net income | 699,907 |  |  |  |  | 699,907 |
Net Income (Loss), Attributable to Noncontrolling Interest | 0 |  |  |  |  |  |
Net income | 699,907 |  |  |  |  |  |
Currency translation adjustment | 11,441 |  |  |  | 11,441 | 0 |
Exercise of stock options, net of repurchased shares | (31,811) |  |  | 68,570 |  | (100,382) |
Employee stock-based compensation and related tax benefit | 23,322 |  |  | 23,322 |  | 0 |
Shares issued for Employee Stock Purchase Plan | 8,276 |  |  | 8,276 |  | 0 |
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 31, 2020 |  |  |  |  |  |  | $ 0
Balances attributable to Parent at Jul. 31, 2020 |  | $ 24 |  | $ 672,727 | $ (121,088) | $ 1,937,853 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options, net of repurchased shares (in shares) |  | 5,401,963 | 1,000 |  |  |  |
Shares issued for Employee Stock Purchase Plan (in shares) |  | 123,106 |  |  |  |  |
Balances (in shares) at Jul. 31, 2020 |  | 235,315,337 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stockholders’ Equity | $ 2,489,516 |  |  |  |  |  |

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