Segment Information Net Sales by Segment and Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Net Sales by Segment and Geographic Area
Net sales	$ 282,426	$ 287,780	$ 575,622	$ 577,931
Americas
Net Sales by Segment and Geographic Area
Net sales	162,656	160,275	333,197	326,166
Europe
Net Sales by Segment and Geographic Area
Net sales	85,070	92,902	171,554	181,417
Asia-Pacific
Net Sales by Segment and Geographic Area
Net sales	34,700	34,603	70,871	70,348
ID Solutions
Net Sales by Segment and Geographic Area
Net sales	209,205	206,432	427,304	416,137
ID Solutions | Americas
Net Sales by Segment and Geographic Area
Net sales	138,324	133,805	284,114	273,209
ID Solutions | Europe
Net Sales by Segment and Geographic Area
Net sales	47,282	49,245	96,110	96,376
ID Solutions | Asia-Pacific
Net Sales by Segment and Geographic Area
Net sales	23,599	23,382	47,080	46,552
Workplace Safety
Net Sales by Segment and Geographic Area
Net sales	73,221	81,348	148,318	161,794
Workplace Safety | Americas
Net Sales by Segment and Geographic Area
Net sales	24,332	26,470	49,083	52,957
Workplace Safety | Europe
Net Sales by Segment and Geographic Area
Net sales	37,788	43,657	75,444	85,041
Workplace Safety | Asia-Pacific
Net Sales by Segment and Geographic Area
Net sales	$ 11,101	$ 11,221	$ 23,791	$ 23,796