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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Parent | Common Stock | Additional Paid-In Capital | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | Accumulated Other Comprehensive Income | Non-controlling Interest | Cumulative Effect, Period of Adoption, Adjustment [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  |  | $ 462,575
Balance at Apr. 30, 2019 |  | $ 2 | $ 176,216 |  | $ 286,351 | $ 2 | $ 4 |  | 462,571
Balance (in shares) at Apr. 30, 2019 |  | 23,946,293 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Apr. 30, 2019 |  |  |  |  |  |  |  |  | 462,575
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 24,611 |  |  |  | 24,604
Net loss attributable to noncontrolling interest |  |  |  |  |  |  | (7) |  | 7
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  | 24,611
Adoption of ASU |  |  |  | $ 665 |  |  |  | $ 665 | 490,357
Foreign currency translation |  |  |  |  |  | 179 |  |  | 179
Stock options exercised |  |  | 93 |  |  |  |  |  | 93
Stock options exercised (in shares) |  | 3,000 |  |  |  |  |  |  |
Restricted stock awards (in shares) |  | 65,692 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  | (11,005) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards |  |  | (743) |  |  |  |  |  | (743)
Tax withholding payment related to net share settlement of equity awards (in shares) |  | (13,364) |  |  |  |  |  |  |
Stock-based compensation |  |  | 2,984 |  |  |  |  |  | 2,984
Balance at Oct. 26, 2019 | $ 490,360 | $ 2 | 178,550 |  | 311,627 | 181 | (3) |  | 490,360
Balance (in shares) at Oct. 26, 2019 |  | 23,990,616 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Oct. 26, 2019 |  |  |  | 665 |  |  |  | 665 | 490,357
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  |  | 481,499
Balance at Jul. 27, 2019 | 481,506 | $ 2 | 177,207 |  | 304,126 | 171 | (7) |  |
Balance (in shares) at Jul. 27, 2019 |  | 23,990,459 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Jul. 27, 2019 |  |  |  |  |  |  |  |  | 481,499
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 7,501 |  |  |  | 7,505
Net loss attributable to noncontrolling interest |  |  |  |  |  |  | 4 |  | (4)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest | 7,501 |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  | 665 |  |  |  | 665 | 481,499
Foreign currency translation | 10 |  |  |  |  | 10 |  |  | 10
Restricted stock awards (in shares) |  | 7,831 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  | (6,285) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards | (75) |  | (75) |  |  |  |  |  | (75)
Tax withholding payment related to net share settlement of equity awards (in shares) |  | (1,389) |  |  |  |  |  |  |
Stock-based compensation | 1,418 |  | 1,418 |  |  |  |  |  | 1,418
Balance at Oct. 26, 2019 | 490,360 | $ 2 | 178,550 |  | 311,627 | 181 | (3) |  | 490,360
Balance (in shares) at Oct. 26, 2019 |  | 23,990,616 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Oct. 26, 2019 |  |  |  | 665 |  |  |  | 665 | 490,357
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  | $ 665 |  |  |  | $ 665 | 490,357
Adoption of ASU |  |  |  |  |  |  |  |  | 509,901
Balance at Apr. 30, 2020 |  | $ 2 | 181,481 |  | 328,090 | 328 |  |  | 509,901
Balance (in shares) at Apr. 30, 2020 |  | 24,063,639 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Apr. 30, 2020 |  |  |  |  |  |  |  |  | 509,901
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 12,174 |  |  |  | 12,115
Net loss attributable to noncontrolling interest |  |  |  |  |  |  | (59) |  | 59
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  | 12,174
Adoption of ASU |  |  |  |  |  |  |  |  | 509,901
Unrealized loss on investments |  |  |  |  |  | (61) |  |  | (61)
Foreign currency translation |  |  |  |  |  | 75 |  |  | 75
Stock options exercised |  |  | 86 |  |  |  |  |  | 86
Stock options exercised (in shares) |  | 3,500 |  |  |  |  |  |  |
Restricted stock awards (in shares) |  | 60,592 |  |  |  |  |  |  |
Restricted stock awards forfeited (in shares) |  | (515) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards |  |  | (1,778) |  |  |  |  |  | (1,778)
Tax withholding payment related to net share settlement of equity awards (in shares) |  | (23,236) |  |  |  |  |  |  |
Stock-based compensation |  |  | 3,509 |  |  |  |  |  | 3,509
Balance at Oct. 31, 2020 | 523,906 | $ 2 | 183,298 |  | 340,264 | 342 | (59) |  | 523,906
Balance (in shares) at Oct. 31, 2020 |  | 24,103,980 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Oct. 31, 2020 |  |  |  |  |  |  |  |  | 523,847
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  |  | 519,892
Balance at Aug. 01, 2020 | 519,929 | $ 2 | 181,406 |  | 338,170 | 351 | (37) |  |
Balance (in shares) at Aug. 01, 2020 |  | 24,104,564 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Aug. 01, 2020 |  |  |  |  |  |  |  |  | 519,892
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 2,094 |  |  |  | 2,072
Net loss attributable to noncontrolling interest |  |  |  |  |  |  | (22) |  | 22
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest | 2,094 |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  |  | 519,892
Unrealized loss on investments | (9) |  |  |  |  | (9) |  |  | (9)
Restricted stock awards (in shares) |  | (245) |  |  |  |  |  |  |
Tax withholding payment related to net share settlement of equity awards | (22) |  | (22) |  |  |  |  |  | (22)
Tax withholding payment related to net share settlement of equity awards (in shares) |  | (339) |  |  |  |  |  |  |
Stock-based compensation | 1,914 |  | 1,914 |  |  |  |  |  | 1,914
Balance at Oct. 31, 2020 | $ 523,906 | $ 2 | $ 183,298 |  | $ 340,264 | $ 342 | $ (59) |  | 523,906
Balance (in shares) at Oct. 31, 2020 |  | 24,103,980 |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Oct. 31, 2020 |  |  |  |  |  |  |  |  | 523,847
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  |  | $ 523,847

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