Segment Information - Schedule of Segment Reporting Information By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Segment Reporting Information [Line Items]
Sales to External Customers	$ 268,630	$ 282,628	$ 551,703	$ 592,868
Segment Profit	50,399	48,495	107,067	107,501
Id Solutions [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	184,880	192,065	381,207	404,162
Segment Profit	37,004	35,719	77,008	79,186
Workplace Safety [Member]
Segment Reporting Information [Line Items]
Sales to External Customers	83,750	90,563	170,496	188,706
Segment Profit	$ 13,395	$ 12,776	$ 30,059	$ 28,315