Cost Reduction Actions - Summary of Radyne Acquisition Related Restructuring Plan (Details) (USD $)	3 Months Ended
	Oct. 31, 2008	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2008
Cost Reduction Actions [Abstract]
Business acquisition restructuring costs, total estimated 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-related exit costs	4,141,000
Less: Interest expense to be accreted	2,041,000
Present value of estimated facility-related exit costs	$ 2,100,000	$ 3,331,000	$ 2,916,000	$ 2,100,000
Radyne lease expiration date	Oct. 31, 2018
Radyne sublease expiration date	Oct. 31, 2015