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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2021
Jul. 31, 2020
Oct. 31, 2020
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization $ (2,346)   $ (2,083)
Net Carrying Amount 7,475    
Gross Carrying Amount 13,686   13,392
Net Carrying Amount 11,340   11,309
Trade names and trademarks      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 3,771   3,771
Accumulated Amortization (994)   (947)
Net Carrying Amount $ 2,777   2,824
Weighted Average Useful Life in Years 10 years 10 years  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 5,010   5,010
Accumulated Amortization (1,179)   (989)
Net Carrying Amount $ 3,831   4,021
Weighted Average Useful Life in Years 9 years 9 years  
Non-competition agreement      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 1,040   1,040
Accumulated Amortization (173)   (147)
Net Carrying Amount $ 867   893
Weighted Average Useful Life in Years 10 years 10 years  
Acquired water and mineral rights      
Finite-Lived Intangible Assets [Line Items]      
Carrying Amount $ 3,865   $ 3,571