Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jan. 31, 2016 USD ($)
Goodwill [Roll Forward]
Balance as of July 31, 2015	$ 433,199
Goodwill, Translation Adjustments	(5,739)
Balance as of January 31, 2016	427,460
Id Solutions [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2015	382,786
Goodwill, Translation Adjustments	(2,772)
Balance as of January 31, 2016	380,014
Workplace Safety [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2015	50,413
Goodwill, Translation Adjustments	(2,967)
Balance as of January 31, 2016	$ 47,446