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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