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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Parent
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income
Non-controlling Interest
Total
Increase (Decrease) in Stockholders' Equity              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest             $ 509,901
Balance at Apr. 30, 2020 $ 509,901 $ 2 $ 181,481 $ 328,090 $ 328    
Balance (in shares) at Apr. 30, 2020   24,063,639          
Increase (Decrease) in Stockholders' Equity              
Net income (loss)       10,080     10,043
Net (income) loss attributable to noncontrolling interest           $ (37) 37
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest 10,080            
Unrealized loss on investments (52)       (52)   (52)
Foreign currency translation 75       75   75
Stock options exercised 86   86       86
Stock options exercised (in shares)   3,500          
Restricted stock awards (in shares)   60,592          
Restricted stock awards forfeited (in shares)   270          
Restricted stock awards forfeited (in shares)   (270)          
Tax withholding payment related to net share settlement of equity awards (1,756)   (1,756)       (1,756)
Tax withholding payment related to net share settlement of equity awards (in shares)   (22,897)          
Stock-based compensation 1,595   1,595       1,595
Balance at Aug. 01, 2020 519,929 $ 2 181,406 338,170 351 (37)  
Balance (in shares) at Aug. 01, 2020   24,104,564          
Increase (Decrease) in Stockholders' Equity              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest             519,892
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest             612,107
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              
Net income (loss)       (13,981)     (13,918)
Net (income) loss attributable to noncontrolling interest           63 (63)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest (13,981)            
Unrealized loss on investments (4)       (4)   (4)
Foreign currency translation (733)       (733)   (733)
Stock options exercised 119   119       119
Stock options exercised (in shares)   4,000          
Restricted stock awards (in shares)   48,588          
Restricted stock awards forfeited (in shares)   (6,140)          
Restricted stock awards forfeited (in shares)   6,140          
Tax withholding payment related to net share settlement of equity awards (1,176)   (1,176)       (1,176)
Tax withholding payment related to net share settlement of equity awards (in shares)   (11,941)          
Stock-based compensation 1,922   1,922       1,922
Balance at Jul. 31, 2021 $ 598,240 $ 2 $ 261,192 $ 337,440 $ (394) $ 77 598,240
Balance (in shares) at Jul. 31, 2021   24,811,802          
Increase (Decrease) in Stockholders' Equity              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest             $ 598,317