Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jan. 31, 2019 USD ($)
Goodwill [Roll Forward]
Balance as of July 31, 2018	$ 419,815
Goodwill, Translation Adjustments	(2,575)
Balance as of January 31, 2019	417,240
ID Solutions
Goodwill [Roll Forward]
Balance as of July 31, 2018	385,524
Goodwill, Translation Adjustments	(2,178)
Balance as of January 31, 2019	383,346
Workplace Safety
Goodwill [Roll Forward]
Balance as of July 31, 2018	34,291
Goodwill, Translation Adjustments	(397)
Balance as of January 31, 2019	$ 33,894