Cost Reduction Actions Wind-Down of Microsatellite Product Line (Details) (USD $)	12 Months Ended
Jul. 31, 2013	Jul. 31, 2012
Restructuring Reserve, Noncurrent	$ 3,773,000
Wind-Down of Microsatellite Product Line [Member]
Restructuring reserve, current	278,000	1,136,000
Restructuring Reserve, Noncurrent	185,000
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	1,136,000
Pre-tax restructuring charge (benefit)	458,000	2,577,000
Payments made	(1,131,000)
Restructuring reserve, ending balance	463,000	1,136,000
Wind-Down of Microsatellite Product Line [Member] \| Cost of Sales [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charge (benefit)		1,270,000
Wind-Down of Microsatellite Product Line [Member] \| Facility exit costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	496,000
Pre-tax restructuring charge (benefit)	644,000
Payments made	(727,000)
Restructuring reserve, ending balance	413,000
Wind-Down of Microsatellite Product Line [Member] \| Severance and related costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	310,000
Pre-tax restructuring charge (benefit)	76,000
Payments made	(386,000)
Restructuring reserve, ending balance	0
Wind-Down of Microsatellite Product Line [Member] \| Other [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	330,000
Pre-tax restructuring charge (benefit)	(262,000)
Payments made	(18,000)
Restructuring reserve, ending balance	$ 50,000

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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