Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Apr. 30, 2019
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 5,478	$ 615	$ 615
Restructuring Charges	3,803	3,006
Payments for Restructuring	1,570	1,963
Ending Balance	7,711	1,658
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs			32,265
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	2,639	367	367
Restructuring Charges	920	553
Payments for Restructuring	20	181
Ending Balance	3,539	739
Legal and Professional Expenses [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1,672	248	248
Restructuring Charges	2,640	1,242
Payments for Restructuring	1,523	571
Ending Balance	2,789	919
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1,167	0	$ 0
Restructuring Charges	243	1,211
Payments for Restructuring	27	1,211
Ending Balance	$ 1,383	$ 0