Segment Information - Schedule of Segment Reporting Information By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 295,278	$ 289,745	$ 282,426	$ 293,196	$ 297,499	$ 298,421	$ 287,780	$ 290,151	$ 1,160,645	$ 1,173,851	$ 1,113,316
Depreciation and amortization									23,799	25,442	27,303
Segment profit									187,978	175,123	156,126
Assets	1,157,308				1,056,931				1,157,308	1,056,931	1,050,223
Expenditures for property, plant & equipment									32,825	21,777	15,167
Americas [Member]
Segment Reporting Information [Line Items]
Net sales									675,944	663,082	653,506
Europe [Member]
Segment Reporting Information [Line Items]
Net sales									344,332	368,002	328,733
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales									140,369	142,767	131,077
Identification Solutions
Segment Reporting Information [Line Items]
Net sales									863,100	846,087	800,392
Depreciation and amortization									21,387	22,075	23,092
Segment profit									164,953	143,411	130,572
Assets	740,437				737,174				740,437	737,174	761,448
Expenditures for property, plant & equipment									17,849	17,283	12,347
Identification Solutions | Americas [Member]
Segment Reporting Information [Line Items]
Net sales									577,156	556,172	544,330
Identification Solutions | Europe [Member]
Segment Reporting Information [Line Items]
Net sales									193,852	197,737	172,776
Identification Solutions | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales									92,092	92,178	83,286
Workplace Safety
Segment Reporting Information [Line Items]
Net sales									297,545	327,764	312,924
Depreciation and amortization									2,412	3,367	4,211
Segment profit									23,025	31,712	25,554
Assets	137,799				138,329				137,799	138,329	154,827
Expenditures for property, plant & equipment									14,976	4,494	2,820
Workplace Safety | Americas [Member]
Segment Reporting Information [Line Items]
Net sales									98,788	106,910	109,176
Workplace Safety | Europe [Member]
Segment Reporting Information [Line Items]
Net sales									150,480	170,265	155,957
Workplace Safety | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales									48,277	50,589	47,791
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 279,072				$ 181,428				$ 279,072	$ 181,428	$ 133,948