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Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 01, 2018
Apr. 30, 2019
Apr. 30, 2018
Jan. 31, 2018
Apr. 30, 2019
Apr. 30, 2018
Jul. 31, 2018
Oct. 31, 2018
Finite-Lived Intangible Assets [Line Items]                
Cost   $ 27,570     $ 27,570      
Accumulated Amortization   (13,597)     (13,597)      
Net   (13,973)     (13,973)     $ (14,939)
Amortization of Intangible Assets   (519) $ (595) $ (519) (1,040) $ (1,160)    
Customer Relationships [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-Lived Intangible Asset, Useful Life             13 years 2 months 14 days  
Cost   17,562     17,562      
Accumulated Amortization   (7,919)     (7,919)      
Net   (9,643)     (9,643)     (10,311)
Developed Technology Rights [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-Lived Intangible Asset, Useful Life             7 years 3 months 1 day  
Cost   7,143     7,143      
Accumulated Amortization   (3,959)     (3,959)      
Net   (3,184)     (3,184)     (3,404)
Noncompete Agreements [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-Lived Intangible Asset, Useful Life             2 years 3 months 14 days  
Cost   824     824      
Accumulated Amortization   (817)     (817)      
Net   (7)     (7)     (15)
Trade Names [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-Lived Intangible Asset, Useful Life             14 years 9 months 14 days  
Cost   1,875     1,875      
Accumulated Amortization   (806)     (806)      
Net   (1,069)     (1,069)     (1,131)
Trademarks [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-Lived Intangible Asset, Useful Life             10 years 14 days  
Cost   166     166      
Accumulated Amortization   (96)     (96)      
Net   (70)     (70)     (78)
Brabant Italy Site Verres S.r.l. [Member]                
Finite-Lived Intangible Assets [Line Items]                
Amortization of Intangible Assets   $ (48)     $ (98)      
Brabant Italy Site Verres S.r.l. [Member] | Above Market Leases [Member]                
Finite-Lived Intangible Assets [Line Items]                
Finite-lived Intangible Assets Acquired $ 1,458              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years              
Brabant Italy Site Verres S.r.l. [Member] | Other Intangible Assets [Member]                
Finite-Lived Intangible Assets [Line Items]                
Accumulated Amortization               $ (1,105)