Segment Information - Schedule of Segment Reporting Information By Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Segment Reporting Information [Line Items]
Sales to External Customers	$ 310,240	$ 307,530
Operating Income (Loss)	26,973	29,687
Segment Profit	59,006	69,341
Id Solutions [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	212,097	209,546
Segment Profit	43,467	50,967
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	98,143	97,984
Segment Profit	$ 15,539	$ 18,374