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Preferred and Common Stock- Schedule of Restricted Stock and Restricted Stock Units Granted (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 05, 2018
Jun. 08, 2018
May 24, 2018
Mar. 29, 2018
Sep. 28, 2017
Jul. 14, 2017
Jun. 01, 2017
Sep. 16, 2016
Jun. 03, 2016
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted                   172,232 126,980 111,150
Officers & Key employees | 2009 Stock Incentive Plan | Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted                 111,150      
Fair Value at Grant Date                 $ 13,849      
Officers & Key employees | 2009 Stock Incentive Plan | Restricted Stock                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted                 40,996      
Fair Value at Grant Date                 $ 5,108      
Non-employee board members | 2009 Stock Incentive Plan | Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted 7,984,000                      
Fair Value at Grant Date $ 920                      
Non-employee board members | 2009 Stock Incentive Plan | Restricted Stock                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted       2,150,000 8,344,000     8,941        
Fair Value at Grant Date       $ 236 $ 920     $ 1,064        
Key Employees | 2009 Stock Incentive Plan | Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted     88,846,000       63,699,000          
Fair Value at Grant Date     $ 8,593       $ 7,388          
Officers | 2009 Stock Incentive Plan | Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Shares Granted   75,402,000       61,126,000            
Fair Value at Grant Date   $ 7,571       $ 6,912            
Award vesting period           3 years            
Compensation not yet recognized   $ 2,800       $ 2,600            
Minimum | Officers | 2009 Stock Incentive Plan | Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Target allocation percentage           0.00%            
Maximum | Officers | 2009 Stock Incentive Plan | Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Target allocation percentage           200.00%