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DEBT - PNC Bank, MidCap Credit Facility and Cerberus Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 30, 2020
Dec. 15, 2017
Jun. 30, 2014
Dec. 31, 2019
Apr. 30, 2020
Jul. 31, 2020
Jul. 31, 2019
Mar. 29, 2020
Apr. 30, 2019
Debt Instrument [Line Items]                  
Unused line fee       0.50%          
Aggregate amount of each consecutive quarterly scheduled principal installment   $ 1,500,000              
Revolving credit facility           $ 0 $ 6,000,000    
PNC Bank Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, term     5 years            
Line of credit facility, maximum credit commitment     $ 50,000,000           $ 25,000,000
MidCap Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, term         3 years        
Line of credit facility, maximum credit commitment       $ 12,500,000          
Debt instrument, percentage points added to the reference rate       4.00%          
Credit facility, readily available borrowing capacity           4,400,000      
Long-term line of credit           0      
Revolving credit facility           $ 0 0    
MidCap Credit Facility | Letter of Credit Sublimit                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum credit commitment       $ 5,000,000          
MidCap Credit Facility | Inventory Sublimit                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum credit commitment       $ 4,500,000          
Cerberus Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, term   5 years              
Proceeds from long-term debt   $ 393,000,000              
Revolving credit facility   $ 25,000,000              
Leverage ratio           3.50%      
Principal deferral amount $ 3,000,000                
Maximum amount borrower may distribute for management fees and tax sharing 5,000,000                
Liquidity requirement 14,500,000             $ 15,000,000  
Principal amount outstanding on the Term Loan           $ 371,972,000 $ 375,125,000    
Cerberus Credit Facility | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, percentage points added to the reference rate   3.75%              
Cerberus Credit Facility | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument, percentage points added to the reference rate   6.50%              
Cerberus Credit Facility | Scenario 1                  
Debt Instrument [Line Items]                  
Excess cash flow payment percentage             50.00%    
Principal payments extinguished $ 4,300,000                
Cerberus Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum credit commitment           25,000,000      
Revolving credit facility           0 $ 6,000,000    
Cerberus Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Principal amount outstanding on the Term Loan           371,972,000 375,125,000    
Current and long-term net           $ 370,995,000 $ 374,237,000    
Rate Applicable When Leverage Ratio is Below 3.50 | Cerberus Credit Facility | Scenario 2                  
Debt Instrument [Line Items]                  
Excess cash flow payment percentage           25.00%