Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jan. 31, 2017 USD ($)
Goodwill [Roll Forward]
Balance as of July 31, 2016	$ 429,871
Goodwill, Translation Adjustments	(5,014)
Balance as of January 31, 2017	424,857
Goodwill, Transfers	0
Id Solutions [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2016	384,529
Goodwill, Translation Adjustments	(4,751)
Balance as of January 31, 2017	382,268
Goodwill, Transfers	2,490
Workplace Safety [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2016	45,342
Goodwill, Translation Adjustments	(263)
Balance as of January 31, 2017	42,589
Goodwill, Transfers	$ (2,490)