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Long-term Debt and Other Credit Arrangements (Details) - USD ($)
$ in Thousands
Jul. 31, 2021
Jul. 30, 2021
Apr. 30, 2021
Debt Instrument [Line Items]      
Remaining borrowing capacity $ 5,600   $ 7,500
Minimum monthly liquidity covenant requirement   $ 2,000  
Minimum Supplemental Liquidity covenant requirement, through calendar year 2021   1,000  
Minimum Supplemental Liquidity covenant requirement, thereafter calendar year 2021   $ 1,500  
Advance Amount One      
Debt Instrument [Line Items]      
Outstanding advances under the long-term debt 8,900   6,800
Advance Amount Two      
Debt Instrument [Line Items]      
Outstanding advances under the long-term debt $ 704   $ 704