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Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-Lived Intangible Asset, Useful Life 9 years 9 years  
Finite-Lived Intangible Assets, Gross $ 45,385 $ 46,595  
Finite-Lived Intangible Assets, Accumulated Amortization 32,670 29,343  
Finite-Lived Intangible Assets, Net 12,715 17,252  
Indefinite-lived Intangible Assets (Excluding Goodwill) 9,619 18,871  
Other intangible assets 22,334 36,123  
Intangible Assets, Gross (Excluding Goodwill) 55,004 65,466  
Amortization of Intangible Assets 5,219 5,776 $ 6,433
Finite-Lived Intangible Asset, Expected Amortization, Year One 5,384    
Finite-Lived Intangible Asset, Expected Amortization, Year Two 5,140    
Finite-Lived Intangible Asset, Expected Amortization, Year Three 2,191    
Impaired Long-Lived Assets Held and Used [Line Items]      
Tangible Asset Impairment Charges 2,681    
Impaired Indefinite-Lived Tradenames, Carrying Value Prior to Impairment Charges 9,328    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 8,665    
Operating Lease, Impairment Loss 2,475    
Impaired Indefinite-Lived Intangible Assets, Fair Value After Impairment 663    
Asset Impairment Charges 13,821 $ 0 $ 0
Identification Solutions      
Impaired Long-Lived Assets Held and Used [Line Items]      
Tangible Asset Impairment Charges 2,353    
Operating Lease, Impairment Loss 440    
Workplace Safety      
Impaired Long-Lived Assets Held and Used [Line Items]      
Tangible Asset Impairment Charges 328    
Operating Lease, Impairment Loss $ 2,035