Reportable Segments - Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 233,371	$ 236,933	$ 288,498	$ 257,246	$ 239,476	$ 228,552	$ 224,538	$ 225,589	$ 1,016,048	$ 918,155	$ 871,922
Total long-lived assets	284,924				198,948				284,924	198,948
Goodwill and intangible assets, net	1,140,204				519,622				1,140,204	519,622
Total	1,425,128				718,570				1,425,128	718,570
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									742,410	665,661	643,744
Total long-lived assets	211,701				128,010				211,701	128,010
Europe/Africa/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									167,360	148,334	131,130
Total long-lived assets	60,752				64,742				60,752	64,742
Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									73,517	66,228	57,108
Total long-lived assets	7,478				4,201				7,478	4,201
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									27,417	32,152	33,524
Total long-lived assets	$ 4,993				$ 1,995				4,993	1,995
Latin America/South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 5,344	$ 5,780	$ 6,416