Segment Information - Schedule of Segment Reporting Information By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Sales to External Customers	$ 268,001	$ 268,630	$ 548,177	$ 551,703
Segment Profit	35,020	29,352	74,539	64,165
Id Solutions [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	190,962	189,780	392,226	390,800
Segment Profit	28,961	23,056	62,035	48,487
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	77,039	78,850	155,951	160,903
Segment Profit	$ 6,059	$ 6,296	$ 12,504	$ 15,678