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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jul. 31, 2020
Oct. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization   $ (1,836) $ (1,084)
Net Carrying Amount   8,000  
Gross Carrying Amount   13,445 13,491
Net Carrying Amount   11,609 12,407
Trade names and trademarks      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount   3,786 3,786
Accumulated Amortization   (801) (542)
Net Carrying Amount   $ 2,985 3,244
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   (914) (500)
Net Carrying Amount   $ 4,096 4,510
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   (121) (42)
Net Carrying Amount   $ 919 998
Weighted Average Useful Life in Years 10 years 10 years  
Acquired water and mineral rights      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount of Indefinite Lived Assets   $ 3,609 $ 3,655