Segment Information - Schedule of Segment Reporting Information By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Sales to External Customers	$ 290,151	$ 280,176
Segment Profit	42,282	39,518
ID Solutions [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	209,705	201,264
Segment Profit	35,837	33,068
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	80,446	78,912
Segment Profit	$ 6,445	$ 6,450