Segment Information - Schedule of Segment Reporting Information By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Segment Reporting Information [Line Items]
Revenues to external customers	$ 282,106	$ 286,816	$ 268,630	$ 283,073	$ 288,636	$ 290,227	$ 282,628	$ 310,240	$ 1,120,625	$ 1,171,731	$ 1,225,034
Depreciation and amortization									32,432	39,458	44,598
Segment profit									229,623	206,342	242,367
Assets	1,043,964				1,062,897				1,043,964	1,062,897	1,253,665
Payments to Acquire Property, Plant, and Equipment									17,140	26,673	43,398
Identification Solutions
Segment Reporting Information [Line Items]
Revenues to external customers									776,877	806,484	825,123
Depreciation and amortization									21,838	25,658	28,955
Segment profit									169,776	149,840	176,129
Assets	742,557				780,524				742,557	780,524	882,440
Payments to Acquire Property, Plant, and Equipment									11,511	18,732	28,774
Workplace Safety
Segment Reporting Information [Line Items]
Revenues to external customers									343,748	365,247	399,911
Depreciation and amortization									4,555	6,772	7,919
Segment profit									59,847	56,502	66,238
Assets	160,172				167,797				160,172	167,797	239,848
Payments to Acquire Property, Plant, and Equipment									5,446	3,970	10,580
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization									6,039	7,028	7,724
Assets	$ 141,235				$ 114,576				141,235	114,576	131,377
Payments to Acquire Property, Plant, and Equipment									$ 183	$ 3,971	$ 4,044