Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2014
Goodwill [Line Items]
Balance as of July 31, 2013	$ 617,236
Translation adjustments	336
Goodwill, Purchase Accounting Adjustments	(2,168)
Balance as of January 31, 2014	615,404
Goodwill, Period Increase (Decrease)	(1,832)
Id Solutions [Member]
Goodwill [Line Items]
Balance as of July 31, 2013	517,030
Translation adjustments	(714)
Goodwill, Purchase Accounting Adjustments	(2,168)
Balance as of January 31, 2014	514,148
Workplace Safety [Member]
Goodwill [Line Items]
Balance as of July 31, 2013	100,206
Translation adjustments	1,050
Balance as of January 31, 2014	$ 101,256