Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2015
Goodwill [Roll Forward]
Balance as of July 31, 2014	$ 515,004
Goodwill, Translation Adjustments	(36,013)
Balance as of January 31, 2015	478,991
Id Solutions [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2014	412,289
Goodwill, Translation Adjustments	(22,177)
Balance as of January 31, 2015	390,112
Workplace Safety [Member]
Goodwill [Roll Forward]
Balance as of July 31, 2014	102,715
Goodwill, Translation Adjustments	(13,836)
Balance as of January 31, 2015	$ 88,879