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