Radyne Acquisition-Related Restructuring Plan - Details of Future Cash Payments (Details) (USD $)	Apr. 30, 2015	Jul. 31, 2014	Oct. 31, 2008	Jul. 31, 2008
Radyne Acquisition Related Restructuring Plan [Abstract]
Future lease payments to be made in excess of anticipated sublease payments	$ 4,117,000	$ 3,773,000	$ 2,100,000	$ 2,100,000
Interest expense to be accreted in future periods	751,000
Total remaining net cash payments	$ 4,868,000