Segment Information Segment Profit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Segment Profit
Segment profit	$ 42,518	$ 41,143	$ 89,621	$ 83,425
ID Solutions
Segment Profit
Segment profit	37,857	34,088	79,419	69,925
Workplace Safety
Segment Profit
Segment profit	$ 4,661	$ 7,055	$ 10,202	$ 13,500