Segment Information - Schedule of Segment Reporting Information By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
Sales to External Customers	$ 298,421	$ 275,927	$ 876,352	$ 824,104
Segment Profit	44,507	37,753	127,933	112,291
Id Solutions [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	212,154	196,880	628,291	589,106
Segment Profit	36,970	32,633	106,896	94,676
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	86,267	79,047	248,061	234,998
Segment Profit	$ 7,537	$ 5,120	$ 21,037	$ 17,615