Acquisition-Related Restructuring Plan - Summary of Radyne Acquisition Related Restructuring Plan (Details) - USD ($)	Apr. 30, 2017	Jul. 31, 2016	Aug. 01, 2008	Jul. 31, 2008
Restructuring and Related Activities [Abstract]
Business acquisition restructuring costs			$ 2,713,000
Business acquisition restructuring costs related to severance for employees			613,000
Total non-cancelable lease obligations			12,741,000
Less: Estimated sublease income			8,600,000
Total net estimated facility exit costs			4,141,000
Less: Interest expense to be accreted			2,041,000
Present value of estimated facility exit costs	$ 2,300,000	$ 3,327,000	$ 2,100,000	$ 2,100,000