Segment Information - Schedule of Segment Reporting Information By Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Segment Reporting Information [Line Items]
Revenues from external customers	$ 305,974	$ 270,866
Operating Income (Loss)	28,831	42,628
Total profit from reportable segments	68,484	71,802
Id Solutions [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	207,990	161,244
Total profit from reportable segments	50,110	43,973
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	97,984	109,622
Total profit from reportable segments	$ 18,374	$ 27,829