Cost Reduction Actions Cost Reduction Actions (Wind-Down of Microsatellite Product Line) (Details) (USD $)	3 Months Ended	6 Months Ended
Jan. 31, 2013	Jan. 31, 2013
Restructuring reserve, noncurrent	$ 3,548,000	$ 3,548,000
Wind-Down of Microsatellite Product Line [Member]
Restructuring reserve - beginning		1,136,000
Restructuring charges	(253,000)	569,000
Payments made		(776,000)
Restructuring reserve - ending	929,000	929,000
Restructuring reserve, current	666,000	666,000
Restructuring reserve, noncurrent	263,000	263,000
Facility exit costs [Member] \| Wind-Down of Microsatellite Product Line [Member]
Restructuring reserve - beginning		496,000
Restructuring charges		654,000
Payments made		(373,000)
Restructuring reserve - ending	777,000	777,000
Severance and related cost [Member] \| Wind-Down of Microsatellite Product Line [Member]
Restructuring reserve - beginning		310,000
Restructuring charges		76,000
Payments made		(386,000)
Restructuring reserve - ending	0	0
Other [Member] \| Wind-Down of Microsatellite Product Line [Member]
Restructuring reserve - beginning		330,000
Restructuring charges		(161,000)
Payments made		(17,000)
Restructuring reserve - ending	$ 152,000	$ 152,000

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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