Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Apr. 30, 2017 USD ($)
Goodwill [Roll Forward]
Balance as of July 31, 2016	$ 429,871
Goodwill, Translation Adjustments	(3,936)
Balance as of January 31, 2017	425,935
Goodwill, Transfers	0
Id Solutions [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2016	384,529
Goodwill, Translation Adjustments	(4,298)
Balance as of January 31, 2017	382,721
Goodwill, Transfers	2,490
Workplace Safety [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2016	45,342
Goodwill, Translation Adjustments	362
Balance as of January 31, 2017	43,214
Goodwill, Transfers	$ (2,490)