Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Apr. 30, 2016 USD ($)
Goodwill [Roll Forward]
Balance as of July 31, 2015	$ 433,199
Goodwill, Translation Adjustments	2,992
Balance as of April 30, 2016	436,191
Id Solutions [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2015	382,786
Goodwill, Translation Adjustments	4,128
Balance as of April 30, 2016	386,914
Workplace Safety [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2015	50,413
Goodwill, Translation Adjustments	(1,136)
Balance as of April 30, 2016	$ 49,277