Reportable Segments - Geographic Areas (Details) - 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
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 239,476	$ 228,552	$ 224,538	$ 225,589	$ 228,854	$ 217,268	$ 213,034	$ 212,766	$ 918,155	$ 871,922	$ 770,157
Total long-lived assets	198,948				120,077				198,948	120,077
Goodwill and intangible assets, net	519,622				505,388				519,622	505,388
Total	718,570				625,465				718,570	625,465
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									665,661	643,744	599,657
Total long-lived assets	128,010				80,918				128,010	80,918
Europe/Africa/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									148,334	131,130	95,753
Total long-lived assets	64,742				35,824				64,742	35,824
Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									66,228	57,108	40,964
Total long-lived assets	4,201				2,531				4,201	2,531
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									32,152	33,524	26,648
Total long-lived assets	$ 1,995				$ 804				1,995	804
Latin America/South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 5,780	$ 6,416	$ 7,135