Segment Information - Schedule of Segment Reporting Information By Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Segment Reporting Information [Line Items]
Revenues from external customers	$ 291,194	$ 272,702	$ 598,724	$ 544,717
Operating Income (Loss)	18,346	21,797	48,034	65,033
Total profit from reportable segments	52,194	58,243	121,535	130,652
Id Solutions [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	194,732	168,234	404,278	330,627
Total profit from reportable segments	37,526	34,643	88,493	79,223
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	96,462	104,468	194,446	214,090
Total profit from reportable segments	$ 14,668	$ 23,600	$ 33,042	$ 51,429