Goodwill and Other Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 437,697	$ 429,871
Goodwill, Foreign Currency Translation Gain (Loss)	(7,827)	(7,826)
Goodwill, Ending Balance	419,815	437,697
Goodwill, Period Increase (Decrease)	(17,882)
Goodwill, Written off Related to Sale of Business Unit	(10,055)
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss		328,029
Goodwill, Impaired [Abstract]
Goodwill, Transfers		0
Identification Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance	391,864	384,529
Goodwill, Foreign Currency Translation Gain (Loss)	(6,340)	(4,845)
Goodwill, Ending Balance	385,524	391,864
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss		118,637
Workplace Safety
Goodwill [Roll Forward]
Goodwill, Beginning Balance	45,833	45,342
Goodwill, Foreign Currency Translation Gain (Loss)	(1,487)	(2,981)
Goodwill, Ending Balance	34,291	45,833
Goodwill, Written off Related to Sale of Business Unit	10,055
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss		209,392
Goodwill, Impaired [Abstract]
Goodwill, Transfers		(2,490)
Id Solutions [Member]
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	$ 0
Goodwill, Impaired [Abstract]
Goodwill, Transfers		$ 2,490