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Preferred and Common Stock- Schedule of Restricted Stock and Restricted Stock Units Granted (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 23, 2019
Sep. 04, 2019
Jun. 24, 2019
Jun. 04, 2019
Sep. 05, 2018
Jun. 08, 2018
May 24, 2018
Mar. 29, 2018
Sep. 28, 2017
Jul. 14, 2017
Jun. 01, 2017
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted                       189,035 172,232 126,980
Key Employees | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted       75,959,000     88,846,000       63,699,000      
Fair Value at Grant Date       $ 9,886     $ 8,593       $ 7,388      
Officers | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted       59,579,000   75,402,000       61,126,000        
Fair Value at Grant Date       $ 9,097   $ 7,571       $ 6,912        
Award vesting period                       3 years    
Compensation not yet recognized       $ 3,100   $ 2,600       $ 2,300        
Non-Employee Board Members | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted   5,504,000     7,984,000     2,150,000            
Fair Value at Grant Date   $ 919     $ 920     $ 236            
Non-Employee Board Members | Stock Incentive Plan | Restricted Stock                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted                 8,344,000          
Fair Value at Grant Date                 $ 920          
CEO | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted 5,000,000   32,786,000                      
Fair Value at Grant Date $ 788   $ 5,700                      
Compensation not yet recognized     $ 1,800                      
Minimum | Officers | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Target allocation percentage                       0.00%    
Minimum | CEO | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Target allocation percentage     0.00%                      
Maximum | Officers | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Target allocation percentage                       200.00%    
Maximum | CEO | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Target allocation percentage     200.00%                      
Tranche One | Officers | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted                       8,444,000    
Fair Value at Grant Date                       $ 1,368    
Tranche Two | Officers | Stock Incentive Plan | Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award                            
Shares Granted                       1,763,000    
Fair Value at Grant Date                       $ 354    
Compensation not yet recognized                       $ 177