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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Parent Adoption of ASU 2018-09 | Parent | Common Stock | Additional Paid-In Capital | Retained Earnings Adoption of ASU 2018-09 | Retained Earnings | Accumulated Other Comprehensive Income | Non-controlling Interest | Adoption of ASU 2018-09 | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 409,056
Balance at Apr. 30, 2018 |  | $ 409,033 | $ 2 | $ 170,139 |  | $ 238,913 | $ (21) | $ 23 |  |
Balance (in shares) at Apr. 30, 2018 |  |  | 23,908,736 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 47,419
Net (income) loss attributable to noncontrolling interest |  |  |  |  |  |  |  | (19) |  | 19
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  | 47,438 |  |  |  | 47,438 |  |  |  |
Unrealized gain (loss) on investments |  | 57 |  |  |  |  | 57 |  |  | 57
Foreign currency translation |  | (34) |  |  |  |  | (34) |  |  | (34)
Stock options exercised |  | 71 |  | 71 |  |  |  |  |  | 71
Stock options exercised (in shares) |  |  | 12,725 |  |  |  |  |  |  |
Restricted stock awards (in shares) |  |  | 57,476 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | 18,023 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | (18,023) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards |  | (1,094) |  | (1,094) |  |  |  |  |  | (1,094)
Tax withholding payment related to net share settlement of equity awards (in shares) |  |  | (14,621) |  |  |  |  |  |  |
Stock-based compensation |  | 7,100 |  | 7,100 |  |  |  |  |  | 7,100
Balance at Apr. 30, 2019 | $ 665 | 462,571 | $ 2 | 176,216 | $ 665 | 286,351 | 2 | 4 |  |
Balance (in shares) at Apr. 30, 2019 |  |  | 23,946,293 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ 665 | 462,575
Net income |  |  |  |  |  |  |  |  |  | 41,070
Net (income) loss attributable to noncontrolling interest |  |  |  |  |  |  |  | (4) |  | 4
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  | 41,074 |  |  |  | 41,074 |  |  |  |
Unrealized gain (loss) on investments |  | 50 |  |  |  |  | 50 |  |  | 50
Foreign currency translation |  | 276 |  |  |  |  | 276 |  |  | 276
Stock options exercised |  | 100 |  | 100 |  |  |  |  |  | 100
Stock options exercised (in shares) |  |  | 16,189 |  |  |  |  |  |  |
Restricted stock awards (in shares) |  |  | 131,991 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | 12,541 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | (12,541) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards |  | (1,062) |  | (1,062) |  |  |  |  |  | (1,062)
Tax withholding payment related to net share settlement of equity awards (in shares) |  |  | (18,293) |  |  |  |  |  |  |
Stock-based compensation |  | 6,227 |  | 6,227 |  |  |  |  |  | 6,227
Balance at Apr. 30, 2020 |  | 509,901 | $ 2 | 181,481 |  | 328,090 | 328 |  |  | 509,901
Balance (in shares) at Apr. 30, 2020 |  |  | 24,063,639 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 509,901
Net income |  |  |  |  |  |  |  |  |  | 23,345
Net (income) loss attributable to noncontrolling interest |  |  |  |  |  |  |  | 14 |  | (14)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  | 23,331 |  |  |  | 23,331 |  |  |  |
Unrealized gain (loss) on investments |  | (60) |  |  |  |  | (60) |  |  | (60)
Foreign currency translation |  | 75 |  |  |  |  | 75 |  |  | 75
Stock options exercised |  | 1,522 |  | 1,522 |  |  |  |  |  | 1,522
Stock options exercised (in shares) |  |  | 53,500 |  |  |  |  |  |  |
Restricted stock awards (in shares) |  |  | 117,468 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | 5,509 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | (5,509) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards |  | (1,992) |  | (1,992) |  |  |  |  |  | (1,992)
Tax withholding payment related to net share settlement of equity awards (in shares) |  |  | (25,597) |  |  |  |  |  |  |
Business acquisition |  | 72,384 |  | 72,384 |  |  |  |  |  | 72,384
Business acquisition (in shares) |  |  | 573,794 |  |  |  |  |  |  |
Stock-based compensation |  | 6,932 |  | 6,932 |  |  |  |  |  | 6,932
Balance at Apr. 30, 2021 |  | $ 612,093 | $ 2 | $ 260,327 |  | $ 351,421 | $ 343 | $ 14 |  | 612,093
Balance (in shares) at Apr. 30, 2021 |  |  | 24,777,295 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 612,107

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